release.csv

id,geo_prompt_en,pro_prompt_en
L1_1,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. The model is a prismatic solid based on a regular hexagon, with uniform material throughout. The base profile of the model is a regular hexagon, with the distance between opposite sides (i.e., the diameter of the inscribed circle) being 50 millimeters, and the center of the hexagon is located at the origin of the coordinates. The hexagonal prism is extruded in the positive Z-axis direction, with a total height of 20 millimeters. At the center of the top surface of the prism, there is a circular through-hole that extends vertically downward through the entire solid, with a diameter of 20 millimeters. Additionally, the six outer edges on the top surface of the hexagonal prism are chamfered at 45 degrees, with a chamfer width of 2 millimeters. Overall, it forms a standard hexagonal positioning nut-shaped base part with a central through-hole and top chamfers.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Enter sketch mode, select the XY plane, and draw a regular hexagon centered at the origin; constrain one pair of opposite sides to be horizontal; dimension the distance between opposite sides (inscribed circle diameter) to 50.0 mm, forming a closed contour. Exit the sketch, perform an extrusion on the hexagonal area, extending it 20.0 mm in the +Z direction to create a hexagonal prism solid. On the top face, create a sketch, draw a concentric circle, and dimension its diameter to 50.0 mm; perform an extruded cut and select ""through all"" to create a central through-hole. Apply a 45�� chamfer with a width of 2.0 mm to the six outer edges of the top face, completing the basic hexagonal nut shape."
L1_2,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is an axisymmetric rotational part with an overall hollow cylindrical structure. The model is 120 millimeters in total length, consisting of a cylinder with a uniform outer diameter. The outer diameter of the cylinder is 40 millimeters, and its axial length is 120 millimeters. A through-hole with a diameter of 25 millimeters runs along the central axis of the part.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Select the XZ plane as the sketch reference plane, enter the sketch, and draw a centerline along the Z direction as the axis of rotation. Draw a closed section in the manner of ""X = radius, Z = axial"": from (12.5,0) to (20.0,0), then to (20.0,60.0), inward to (20.0,60.0), add a 3.0 mm fillet at the step corner; continue to (20.0,120.0), inward to (12.5,120.0), and close axially back to the starting point, forming a hollow stepped shaft sleeve section. Exit the sketch, perform a revolve operation, select this profile, choose the centerline as the axis of rotation, and set the angle to 360�� to generate a solid with a through hole and fillet transitions."
L1_3,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a model of a cube with a circular through-hole in the center. The main body is a cube with an edge length of 50 millimeters, centered at the origin. In the exact center of the cube, a cylindrical hole with a diameter of 20 millimeters is cut along the Z-axis. The hole passes through the top and bottom surfaces of the cube. Overall, it forms a standard cubic block with a central circular hole.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a square centered at the origin on the XY plane, with a side length of 50.0 mm; exit the sketch and extrude 50.0 mm along the +Z direction to form a cube. Create a sketch on the top face, draw a circle centered at the origin, and label the diameter as 20.0 mm; perform an extruded cut through the entire part to create a central through-hole."
L1_4,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a stepped solid formed by stacking two cylinders vertically. At the bottom is a large cylinder with a diameter of 80 millimeters and a height of 20 millimeters. Centered on the upper surface of the large cylinder, a smaller cylinder with a diameter of 40 millimeters and a height of 30 millimeters is stacked. The axes of the two cylinders coincide. Overall, it forms a simple two-step cylindrical body.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 80.0 mm) on the XY plane and extrude it 20.0 mm to form the bottom cylinder. On its top surface, draw a concentric circle (diameter 40.0 mm) and extrude it 30.0 mm using the merge/join method, resulting in a two-tier cylindrical step stacked vertically."
L1_5,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a composite structure with a cylinder standing on a square base. The base is a rectangular plate with a length and width of 60 millimeters and a height of 10 millimeters. At the exact center of the upper surface of the base, a cylinder with a diameter of 30 millimeters and a height of 50 millimeters grows vertically upward. The cylinder is tightly connected to the base. The overall appearance resembles a simple display stand.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a square base profile (side length 60.0 mm) on the XY plane, and extrude it by 10.0 mm to form the base. At the center of the top surface of the base, draw a circle (diameter 30.0 mm), extrude it by 50.0 mm, and merge it to obtain a combined body of a central cylindrical pillar and a square base."
L1_6,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a ring-shaped solid, similar to a flat washer. The main body is a flat cylinder with a diameter of 100 millimeters and a thickness of 5 millimeters. At the center of the cylinder, a circular through-hole with a diameter of 50 millimeters is drilled vertically. The hole walls are perpendicular to the top surface. The overall structure is a standard flat ring.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 100.0 mm) on the XY plane, and extrude it by 5.0 mm to form a disk. On the top surface, draw a concentric circular hole (diameter 50.0 mm), and extrude it to cut through the entire thickness, resulting in a washer."
L1_7,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cross-shaped structure composed of two rectangular prisms intersecting perpendicularly. The main body is a rectangular prism 100 millimeters long, 20 millimeters wide, and 20 millimeters high, placed along the X-axis. Another rectangular prism of the same dimensions is placed along the Y-axis, with both centers coinciding and penetrating each other. They form a planar ""cross"" shape. The overall structure constitutes a basic cross-beam structure.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a rectangle (100.0 mm long and 20.0 mm wide) centered on the XY plane, and extrude it 20.0 mm to form the first beam. On the same plane, draw another rectangle (20.0 mm long and 100.0 mm wide) centered, and extrude it 20.0 mm, selecting the merge/join option to make the two beams intersect orthogonally at the center and fuse into a cross structure."
L1_8,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a rectangular prism with a hemispherical pit on its surface. The main body is a rectangular prism measuring 80 millimeters in length, 80 millimeters in width, and 40 millimeters in height. At the center of the upper surface of the rectangular prism, a hemisphere with a radius of 20 millimeters is removed. The edge of the pit is flush with the upper surface. The overall shape forms a cube with a spherical liquid storage cavity.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the bottom sketch plane and the Z-axis as the upward direction. Draw a rectangle (80.0 mm long and 80.0 mm wide) centered on the XY plane, and extrude it 40.0 mm to form a cube. Create a hemispherical recess at the center of the top surface: use the center of the top surface as the projection point for the sphere center, construct a sphere with a radius of 20.0 mm as the cutting body, and perform a difference operation with the cube (cutting only the upper hemisphere) to form a hemispherical recess."
L1_9,"The Z-axis is the main axis/height direction; the XY axes are the width/thickness directions. This is a microphone-shaped assembly. At the bottom, there is a cylindrical handle with a diameter of 30 millimeters and a height of 100 millimeters. At the center of the top of the cylinder, a sphere with a diameter of 40 millimeters is placed. The center of the sphere is located directly above the center of the top surface of the cylinder (15 millimeters above the top surface), and the bottom of the sphere is embedded 5 millimeters into the cylinder. The overall structure forms a simple rod-top-sphere configuration.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a circle (diameter 30.0 mm) on the XY plane and extrude it 100.0 mm to form a cylinder. Create a sphere (diameter 40.0 mm) and position its center 5.0 mm above the center of the top surface of the cylinder; set the Z-coordinate of the sphere's center to 115.0 mm. Perform a Boolean union/Union to merge the two."
L1_10,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a slider structure with a rectangular slot in the middle. The main body is a cuboid measuring 100 millimeters in length, 50 millimeters in width, and 30 millimeters in height. At the center of the upper surface of the cuboid, a straight slot 20 millimeters wide and 15 millimeters deep is cut along the length direction. The slot runs through the entire length. Overall, it forms a U-shaped cross-section slider.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a rectangle (100.0 mm long and 50.0 mm wide) centered on the XY plane, and extrude it 30.0 mm to form a rectangular prism. On the top surface, sketch a through-length slot: draw a centered rectangle with a slot width of 20.0 mm and a slot length of 100.0 mm along the length direction; perform an extrude cut downward to a depth of 15.0 mm to form a straight slot on the top surface."
L1_11,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cylinder with an off-center hole. The main body is a cylinder with a diameter of 60 millimeters and a height of 40 millimeters. A through-hole with a diameter of 10 millimeters is drilled along the Z-axis, 15 millimeters away from the center. The hole is parallel to but not coincident with the outer cylinder's axis. The overall part is a cylindrical component with an eccentric through-hole.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a circle (diameter 60.0 mm) on the XY plane and extrude it 40.0 mm to form a cylinder. Create a sketch on the top surface and place the center of the hole: offset 15.0 mm in the +X direction; draw a hole with a diameter of 10.0 mm. Perform an extruded cut through the entire part to create an eccentric hole."
L1_12,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a circular flange with a square hole in the center. The main body is a cylinder with a diameter of 90 millimeters and a thickness of 15 millimeters. At the center of the cylinder, a square through-hole with a side length of 30 millimeters is cut vertically. The center of the square hole coincides with the center of the cylinder. The overall structure forms a basic connecting part with an outer circle and an inner square.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 90.0 mm) on the XY plane and extrude it by 15.0 mm to form a disk. Create a sketch on the top surface and draw a central square hole (side length 30.0 mm); perform an extruded cut through the entire part to obtain a disk with a square hole."
L1_13,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a T-shaped solid composed of two cylinders connected vertically. The horizontal part is a cylinder with a diameter of 20 millimeters and a length of 80 millimeters. At the midpoint of the horizontal cylinder, a vertical cylinder with a diameter of 20 millimeters and a length of 40 millimeters is joined perpendicularly. The two cylinders intersect and merge directly without any chamfering. The overall structure forms a solid T-shaped cylindrical structure.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 20.0 mm) in the YZ plane and extrude it 80.0 mm along the X-axis to form a cylinder. At X=40.0 mm, create a datum plane (parallel to YZ), sketch a circle of the same diameter, and extrude it 40.0 mm along the +Z direction, setting the extrusion method to merge/join, forming a T-shaped cylinder."
L1_14,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a composite body consisting of a cylinder with a cone on top. The base is a cylinder with a diameter of 50 millimeters and a height of 20 millimeters. Above the center of the base, there is a cone with a base diameter of 50 millimeters and a height of 40 millimeters. The base of the cone completely overlaps with the top surface of the cylinder. The overall shape resembles a pointed column marker.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 50.0 mm) on the XY plane and extrude it 20.0 mm to form a cylinder. To create a cone, select the XZ plane to draw the cone profile: a right-angled triangle contour with a base radius of 25.0 mm and a height of 40.0 mm, then revolve it 360�� around the Z-axis to form the cone. Merge the cone with the cylinder to form a body with a cylindrical base and a conical top."
L1_15,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cube with one corner cut off. The main body is a cube with an edge length of 50 millimeters. At one vertex of the cube, a corner is cut off by a 45-degree plane, forming a regular triangular section, with each edge being cut by 15 millimeters. The overall shape is a cubic block with a missing corner.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Create a cube: draw a square (side length 50.0 mm) on the XY plane and extrude it by 50.0 mm. Remove one corner: select any vertex and measure 15.0 mm along each of the three adjacent edges from the vertex to define the cutting points; create a cutting plane through these three points; perform a plane cut/split solid to remove the outer corner outside this plane, resulting in a cube with a missing corner."
L1_16,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a rectangular plate with two symmetrical circular holes. The main body is 120 millimeters long, 40 millimeters wide, and 10 millimeters thick. On the central axis, 20 millimeters from each end, there are through-holes with a diameter of 10 millimeters. The two holes are identical in size and symmetric about the center. Overall, it is a standard double-hole fixed clamp plate.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a rectangular plate (120.0 mm long and 40.0 mm wide) on the XY plane, and extrude it by 10.0 mm to form the plate. On the top surface, sketch two holes: place the centers of the two circular holes along the length centerline, each 20.0 mm from the left and right end faces; the hole diameter is 10.0 mm. Perform an extruded cut through the entire thickness to complete the double-hole plate."
L1_17,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a square block with an arched cutout. The main body is a rectangular prism that is 60 millimeters long, 30 millimeters high, and 20 millimeters thick. At the center of the bottom surface, a semicircular cylindrical through-hole with a radius of 20 millimeters is removed, forming an arch shape. The axis of the semicircle runs through the thickness direction. The overall structure resembles a miniature arch bridge pier.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a rectangle (60.0 mm long and 20.0 mm thick) on the XY plane, and extrude it 30.0 mm to form a block. Create a sketch on the front side, draw a semicircle with a radius of 20.0 mm centered at the midpoint of the bottom edge, and close it to form a semicircular profile; perform an extruded cut through the thickness to create a semicircular arch-shaped recess."
L1_18,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a capsule shape with hemispheres at both ends and a cylinder in the middle. The central part is a cylinder with a diameter of 30 millimeters and a length of 60 millimeters. At each end of the cylinder, a hemisphere with a radius of 15 millimeters is attached. The flat surface of the hemispheres perfectly joins with the end faces of the cylinder. The entire structure forms a standard elongated pill-shaped solid.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Select the XZ plane to draw the capsule cross-section and revolve it: use the X-axis as the axis of rotation. Draw a 60.0 mm long straight line segment at a radius of 15.0 mm from the X-axis, and close the ends with 15.0 mm radius arcs tangent to the X-axis, forming a closed profile. Perform a 360�� revolution to generate the solid."
L1_19,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a stretched body of a planar figure consisting of two concentric rings with different diameters. The outer ring is a cylindrical tube with an outer diameter of 80mm, an inner diameter of 60mm, and a height of 20mm. The inner ring is a cylindrical tube with an outer diameter of 40mm, an inner diameter of 20mm, and a height of 20mm. The two tubes are placed concentrically with a gap between them, forming two independent concentric cylindrical tube structures.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. In the XY plane, draw four concentric circles: the outer ring has an outer diameter of 80.0 mm and an inner diameter of 60.0 mm, and the inner ring has an outer diameter of 80.0 mm and an inner diameter of 60.0 mm. Select the outer and inner ring areas separately and perform an extrusion along the +Z direction for 20.0 mm; for the second extrusion, select ""New Body"" to keep the two independent concentric rings."
L1_20,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a wedge-shaped object with a right trapezoidal cross-section. It is formed by cutting a rectangular prism diagonally. The base is 80 millimeters long and 40 millimeters wide, with a height of 30 millimeters at the rear end and 5 millimeters at the front end, forming an inclined surface. Overall, it constitutes a simple wedge stop.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a trapezoidal side profile in the XZ plane: the base length is 80.0 mm, the left end height is 30.0 mm, the right end height is 5.0 mm, and close the profile. Exit the sketch and extrude along the +Y direction with a width of 40.0 mm to form the wedge block."
L1_21,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cylinder with an annular groove on its side. The main body is a cylinder with a diameter of 50 millimeters and a height of 80 millimeters. At the midpoint of the height, a rectangular annular groove 10 millimeters wide and 5 millimeters deep is cut inward along the circumference. The groove divides the side of the cylinder into upper and lower parts. The overall shape resembles a pulley hub blank.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 50.0 mm) on the XY plane and extrude it 80.0 mm to form a cylinder. On the XZ plane, draw a rectangular cross-section for the annular groove: the outer edge of the rectangle intersects with the outer surface of the cylinder, with a radial cut depth of 5.0 mm and an axial width of 10.0 mm, centered at z=40.0 mm. Perform a 360�� revolved cut around the Z-axis to create the central annular groove."
L1_22,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a model of a frustum with a hole in the middle. The main body is a truncated square pyramid, with a base that is a 60x60 millimeter square, a top that is a 40x40 millimeter square, and a height of 30 millimeters. A cylindrical hole with a diameter of 20 millimeters runs vertically through the center. The overall structure is a tapered block with a central hole.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a square (side length 60.0 mm) on the XY plane, then exit the sketch. Extrude and draft along the +Z direction for 30.0 mm, reducing the top face side length to 40.0 mm (equivalent draft angle of approximately 18.43��); if not supported, draw a 40.0 mm square on the z=30.0 mm plane and use lofting between the bottom and top faces to create a frustum. On the top face, draw a central circular hole (diameter 20.0 mm) and extrude cut through the entire part."
L1_23,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a structure composed of two cylinders placed side by side. On the left is a large cylinder with a diameter of 50 millimeters and a length of 50 millimeters. On the right, adjacent to it, is a small cylinder with a diameter of 30 millimeters and a length of 50 millimeters, with a center-to-center distance of 40.0 millimeters between the two cylinders. The bases of the two cylinders are aligned, their axes are parallel, and their sides are tangent. The overall structure consists of two cylinders adhered side by side.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. In the XY plane, draw two externally tangent circles: the larger circle has a diameter of 50.0 mm, the smaller circle has a diameter of 30.0 mm, and the distance between their centers is 40.0 mm. Ensure that both circles share the same starting plane. Exit the sketch, extrude along the +Z direction by 50.0 mm and merge, resulting in two side-by-side, tangent cylinders."
L1_24,"The Z-axis is the vertical direction (height/thickness composite direction); the X-axis is the horizontal length/thickness composite direction; the Y-axis is the width direction. This is an L-shaped bent plate structure. It is composed of two rectangular prisms joined perpendicularly. The vertical part is 60 millimeters high, 40 millimeters wide, and has a thickness of 10 millimeters along the X-axis; the horizontal part is 50 millimeters long, 40 millimeters wide, and has a thickness of 10 millimeters along the Z-axis. The two parts overlap and merge at the corner near the origin. The overall structure forms a right-angle connecting bracket.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a vertical rectangular plate (40.0 mm wide and 60.0 mm high) on the YZ plane, and extrude it 10.0 mm along the +X direction to form the vertical plate. Draw a horizontal rectangular plate (50.0 mm long and 40.0 mm wide) on the XY plane, and extrude it 10.0 mm along the +Z direction to form the horizontal plate. Align and overlap one end of the horizontal plate with the inner corner at the bottom of the vertical plate. Finally, perform a Boolean union to obtain the L-shaped bracket."
L1_25,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cylindrical structure with a countersunk hole. The main body has a diameter of 40 millimeters and a height of 40 millimeters. There is a through-hole in the center, with an upper large hole of 20 millimeters in diameter and 10 millimeters deep, and a lower through-hole of 10 millimeters in diameter. The step face of the hole is parallel to the top surface. The overall structure is a standard countersunk screw mounting base.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 40.0 mm) on the XY plane, and extrude it 40.0 mm to form a cylinder. On the top surface, draw a through-hole circle (diameter 10.0 mm), and extrude to cut through the entire part. On the same top surface, draw a counterbore circle (diameter 20.0 mm), and extrude to cut a depth of 10.0 mm, forming a stepped hole."
L1_26,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a sphere with a portion removed. The main body is a sphere with a radius of 30 millimeters. At 15 millimeters above the center of the sphere, a horizontal plane cuts off the top of the sphere. The cutting surface is a circular plane. The overall appearance resembles a sphere with its top flattened.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Use the sphere command to create a sphere with a radius of 30.0 mm centered at the origin. Create a datum plane offset 15.0 mm in the +Z direction from the XY plane. Use the Split Body command to cut the sphere with this plane and delete the portion above the plane, retaining the lower part to obtain a top-truncated sphere."
L1_27,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a thickened rectangular prism at one end. The main body is a strip that is 100 millimeters long, 20 millimeters wide, and 10 millimeters thick. A block 20 millimeters long, 20 millimeters wide, and 30 millimeters high is added to the lower left end as a base. Both are combined into a single unit. The overall structure is an inverted L-shaped cantilever.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a rectangular beam cross-section (100.0 mm long and 20.0 mm wide) on the XY plane, and extrude it by 10.0 mm to form a cantilever beam. Create a base at the bottom of the left end of the beam: sketch a rectangle (20.0 mm long and 20.0 mm wide), and extrude it by 30.0 mm to form the base block. Align the top surface of the base with the bottom surface of the beam, centering it in the width direction, and perform a Boolean union to obtain the cantilever beam structure."
L1_28,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a model of a cube containing a tangent cavity inside. The exterior is a cube with an edge length of 60 millimeters. In the center, a spherical space with a diameter of 61 millimeters is removed. The overall structure is a hollow cube with openings only at the centers of its six faces.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a square (side length 60.0 mm) on the XY plane and extrude it by 60.0 mm to form a cube. Create a sphere (diameter 61.0 mm) at the geometric center of the cube, then perform a Difference operation to subtract the sphere from the cube, resulting in a cubic block with an inscribed spherical cavity."
L1_29,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a three-layer cylindrical structure that gradually decreases in size. The bottom layer has a diameter of 60mm and a height of 10mm, the middle layer has a diameter of 40mm and a height of 10mm, and the top layer has a diameter of 20mm and a height of 10mm. The axes of all three layers are aligned and stacked sequentially upward. Overall, it forms a three-step stepped shaft.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a bottom circle (diameter 60.0 mm) on the XY plane, and extrude it by 10.0 mm to form the bottom cylinder. On its top surface, draw a concentric circle (diameter 40.0 mm), extrude it by 10.0 mm, and merge to form the middle layer. On the top surface of the middle layer, draw a concentric circle (diameter 20.0 mm), extrude it by 10.0 mm, and merge to form the top layer, resulting in a three-tiered pagoda column."
L1_30,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a solid cylinder with a side hole. The main body is a cylinder with a diameter of 30 millimeters and a height of 60 millimeters. At the midpoint of the height, a through-hole with a diameter of 10 millimeters is drilled radially (along the Y-axis). The hole's axis intersects perpendicularly with the cylinder's axis. The overall structure is a pin shaft with a transverse pin hole.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 30.0 mm) on the XY plane and extrude it 60.0 mm to form a cylinder. Create a sketch on the XZ plane and draw a circle (diameter 10.0 mm) at point (0,30.0). Perform an extruded cut through the entire part, with the cut direction along ��Y, to form a lateral through-hole in the middle of the cylinder."
L1_31,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a sphere with a square through-hole in the center. The radius of the sphere is 25 millimeters. Along the Z-axis, a square prism through-hole with a side length of 20 millimeters is cut out. The square hole runs through both ends of the sphere. The overall shape resembles a bead penetrated by a square hole.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Create a sphere with a radius of 25.0 mm centered at the origin. Draw a square (side length 20.0 mm) on the XY plane, and symmetrically extrude it along the ��Z direction with a length �� 50.0 mm to form a square column cutting body. Perform a difference operation using the sphere to subtract the square column, resulting in a square hole through the sphere."
L1_32,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a rectangular prism with two diagonal corners removed. The main body is a block measuring 80x50x30 millimeters. At the left front upper corner and the right rear lower corner, a tetrahedral corner is cut off, with each of the three adjacent edges being 10 millimeters. The cutouts are triangular. Overall, it is a rectangular block with asymmetrical chamfered corners.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a rectangle (80.0 mm long and 50.0 mm wide) on the XY plane and extrude it 30.0 mm to form a rectangular prism. Chamfer the upper left front corner: measure 10.0 mm along the three adjacent edges from that corner to establish a cutting plane through three points, and remove the outer tetrahedral volume. Repeat the same operation for the lower right rear corner (with edge length 10.0 mm) to complete the two diagonal chamfers."
L1_33,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a semi-cylindrical shell structure. It consists of a semi-cylinder with an outer radius of 30 millimeters, minus a concentric semi-cylinder with an inner radius of 20 millimeters. The length is 100 millimeters. Overall, it forms a semi-circular channel with a wall thickness of 10 millimeters.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the bottom sketch plane and the Z-axis as the upward direction. In the YZ plane, draw a semicircular pipe cross-section: draw a concentric semicircular arc with an outer radius of 30.0 mm and an inner radius of 20.0 mm, and close it with a diameter line to form a semicircular ring area. Extrude this area 100.0 mm in the +X direction to generate a semicircular pipe groove solid."
L1_34,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a long, solid entity with a cross-section in the shape of a ""convex"" character. The lower part is a rectangular prism 60 millimeters wide and 20 millimeters high; centered on top of it is another rectangular prism 30 millimeters wide and 20 millimeters high. The total length is 100 millimeters. Overall, it forms the basic shape of a guide rail slider.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a rectangle on the XY plane (length 100.0 mm, width 60.0 mm), and extrude it 20.0 mm to form the lower cuboid. On its top surface, draw a centered rectangle (length 100.0 mm, width 30.0 mm), extrude it 20.0 mm, and merge it to form a T-shaped slider."
L1_35,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cylinder with a conical pit on the top. The main body has a diameter of 40 millimeters and a height of 40 millimeters. A conical pit with a base diameter of 30 millimeters and a depth of 15 millimeters is cut from the center of the top surface, with the tip of the pit pointing inward toward the cylinder. Overall, it is a base with a centered conical hole.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 40.0 mm) on the XY plane and extrude it 40.0 mm to form a cylinder. On the XZ plane, draw a triangular profile for the conical pit: the radius at the top is 15.0 mm, and the depth is 15.0 mm; perform a revolved cut of 360�� around the Z-axis to form the conical recess."
L1_36,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a ring with non-uniform wall thickness. The outer diameter is 80 millimeters, and the inner diameter is 40 millimeters. The center of the inner circle is offset 10 millimeters to the right relative to the center of the outer circle. Both cylindrical surfaces have a height of 20 millimeters. Overall, it forms an eccentric ring that is thicker on one side and thinner on the other.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw an outer circle (diameter 80.0 mm, centered at the origin) on the XY plane, and extrude it 20.0 mm to form an outer cylinder. On the same plane, draw an inner circle (diameter 40.0 mm) and offset its center 10.0 mm along the +X direction; extrude it 20.0 mm to form a cut-out body. Perform a difference operation using the outer cylinder to subtract the offset inner cylinder, resulting in an eccentric ring."
L1_37,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a circular disc with a through cross slot on its surface. The main body has a diameter of 80 millimeters and a thickness of 15 millimeters. Two rectangular slots, each 10 millimeters wide and 5 millimeters deep, are cut from the center of the upper surface, perpendicular to each other and extending to the edge of the disc, forming a through cross shape. Overall, it is a circular disc with a cross-shaped through slot on its surface.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a circle (diameter 80.0 mm) on the XY plane and extrude it 15.0 mm to form a disk. On the top surface, sketch two perpendicular center slots in the shape of rectangles, with a slot width of 10.0 mm and a length greater than the diameter to pass through the center. Perform an extruded cut with a depth of 5.0 mm to obtain a cross-slotted disk."
L1_38,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a column with a rhombus cross-section. The base is a rhombus with diagonals measuring 60 millimeters and 30 millimeters. It is stretched along the Z-axis to a height of 80 millimeters. The overall shape is a simple quadrilateral prism, but the cross-section is not a square.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. In the XY plane, draw a rhombus: sketch two perpendicular diagonals intersecting at the origin, label the long diagonal as 60.0 mm and the short diagonal as 30.0 mm, and connect the endpoints to close the shape. Extrude 80.0 mm to form a rhombic prism."
L1_39,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a plate with a rectangular prism at one end connected to a half-cylinder. On the left is a rectangular prism 60 millimeters long and 40 millimeters wide; on the right is a half-cylinder with a diameter of 40 millimeters, joined to the width edge of the rectangular prism. The thickness is uniformly 10 millimeters. Overall, it forms a connection plate that resembles half of a racetrack shape.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw the outer contour on the XY plane: first, draw a rectangle (length 60.0 mm, width 40.0 mm); then, at the midpoint of the right side of the rectangle, draw a semicircle with a diameter of 40.0 mm, making it tangent to the top and bottom sides and closing with the right side to form a closed contour. Exit the sketch and extrude 10.0 mm to generate a fillet transition plate."
L1_40,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a stepped shaft that is thinner at both ends and thicker in the middle. The middle section has a diameter of 15 millimeters and a length of 20 millimeters; at each end, there is a smaller cylinder with a diameter of 30 millimeters and a length of 20 millimeters. All cylinders are coaxial. The overall shape is a dumbbell-like basic shaft component.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw a half-sectional view of the stepped shaft in the XZ plane and revolve it around the Z-axis. Define the radii along the axial direction from 0 to 60.0 mm as follows: end radius 15 mm (length 20.0 mm) �� middle section radius 7.5 mm (length 20.0 mm) �� end radius 15 mm (length 20.0 mm). After closing the profile, perform a 360�� revolution to generate the double-ended stud."
L1_41,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a model of a disc with four small holes distributed on it. The main body is a disc with a diameter of 100mm and a thickness of 10mm. On a circle with a radius of 35mm, there are four circular holes with a diameter of 10mm, evenly distributed (one at the top, bottom, left, and right). All the holes are vertically through. The whole is a standard four-hole flange.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. The geo_prompt does not specify the thickness of the disc, so we will assume a thickness of 10.0 mm. Draw a circle (diameter 100.0 mm) on the XY plane and extrude it by 10.0 mm to form the disc. On the top surface, draw a construction circle (radius 35.0 mm) as the hole distribution circle; place a hole circle (diameter 10.0 mm) on this distribution circle, and first extrude and cut through the entire thickness to create a hole. Perform a circular pattern on this hole, selecting the Z-axis as the array axis, with a quantity of 4 and an angle of 360��, resulting in four equally spaced holes."
L1_42,The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cylindrical body with a tilted top surface. The main diameter is 30 millimeters and the height is 50 millimeters. The top is cut off by a plane that forms a 30-degree angle with the base. The cross-section is elliptical. The overall shape is a solid cylinder used as an inclined support.,"First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 30.0 mm) on the XY plane and extrude it 50.0 mm to form a cylinder. Create an inclined plane: pass through the edge point (-15.0,0,50.0) on the top surface of the cylinder and incline the plane at an angle of 30.0�� relative to the horizontal plane (tilted along the X direction). Perform a split entity/planar cut to remove the material above the plane (with a height difference of about 17.32 mm), resulting in a beveled cylinder."
L1_43,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction, with units in millimeters (mm). This is a long strip with a C-shaped cross-section, similar to a channel steel. It is formed by removing a rectangular groove 30 mm wide, 20 mm high, and 100 mm long from the top center of a rectangular prism that is 50 mm wide, 30 mm high, and 100 mm long, leaving three sides with wall thickness. The overall structure forms a continuous U-shaped channel.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Draw an outer rectangle (100.0 mm long and 50.0 mm wide) on the XY plane, and extrude it by 30.0 mm to form the external solid. On the top surface, draw a centered slot rectangle, with the slot length being 100.0 mm and the slot width 30.0 mm. Perform an extruded cut downward to a depth of 20.0 mm, leaving side wall thicknesses of about 10.0 mm and a bottom wall thickness of about 10.0 mm, to obtain the I-beam shape."
L1_44,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cube with a stepped hole in the center. The side length of the main body is 40 millimeters. First, a through-hole with a diameter of 20 millimeters is drilled in the center, then a counterbore with a diameter of 30 millimeters and a depth of 10 millimeters is drilled from the top surface. The overall structure is a square counterbore seat.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Create a cube: draw a square with a side length of 40.0 mm and extrude it by 40.0 mm. On the top face, draw a through hole circle (diameter 20.0 mm) and cut it through. On the top face, draw a counterbore circle (diameter 30.0 mm) and cut to a depth of 10.0 mm, resulting in a stepped hole cube."
L1_45,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a hollow hemispherical shell. It is composed of a hemisphere with an outer radius of 50 millimeters, minus a concentric hemisphere with an inner radius of 40 millimeters. The cut plane faces downward. The overall structure forms a bowl-shaped structure with uniform thickness.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Create an outer sphere (radius 50.0 mm) and split it using the XY plane, retaining only the upper hemisphere (z��0). Create an inner sphere (radius 40.0 mm) and also retain only the upper hemisphere. Perform a difference operation, subtracting the inner hemisphere from the outer hemisphere, to obtain a hemispherical cap with a wall thickness of 10.0 mm."
L1_46,"The Z-axis is the main axis/thickness direction; the X-axis is the 30-millimeter right-angle side direction; the Y-axis is the 40-millimeter right-angle side direction. This is a prism with a right-angled triangular base. The two right-angle sides of the base triangle are 30 millimeters and 40 millimeters, respectively. The height of the prism is 60 millimeters. The overall shape is the basic form of an optical prism.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a right triangle on the XY plane: the two legs are 30.0 mm along the X-axis and 40.0 mm along the Y-axis, and close the shape. Extrude 60.0 mm to form a triangular prism."
L1_47,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a model with a keyway on the shaft. The main body is a cylinder with a diameter of 40 millimeters and a length of 80 millimeters. A 40-millimeter long, 10-millimeter wide, and 5-millimeter deep track-shaped or rectangular groove is cut axially along the side of the cylinder. The whole is a drive shaft with a local groove.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 40.0 mm) on the XY plane and extrude it 80.0 mm to generate the shaft segment (the axis along the Z-axis). Create a tangent plane: at y=+20.0 mm, create a plane parallel to the XZ plane. On this plane, draw the keyway profile: a rectangle with a length of 80.0 mm along the Z-axis and a width of 10.0 mm along the X-axis, centered axially (Z=40.0 mm). Perform an extruded cut in the -Y direction with a depth of 5.0 mm to form the keyway."
L1_48,"This is a transition block with a square bottom and a round top. The base is a rectangular prism measuring 40x40x20 millimeters, with a cylinder of 20 millimeters in diameter and 20 millimeters in height centered on top. The two are directly stacked. Overall, it is a simple square-to-round base.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a rectangular base (40��40) and extrude it by 20.0 mm to form a cubic base. On the top surface center, draw a circle (diameter 20.0 mm), extrude it by 20.0 mm, and merge it to obtain a square-round joint."
L1_49,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a cube with holes in all three directions. It is a cube with an edge length of 40 millimeters. Holes with a diameter of 10 millimeters are drilled through the center along the X, Y, and Z axes. The three holes intersect at the center of the cube. The overall structure is a hollow cube that is open on all six sides.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis pointing upwards. Create a cube with an edge length of 40.0 mm. Cut a through-hole along the Z-axis at the center of the top face: the hole diameter is 10.0 mm. Cut a through-hole along the X-axis at the center of the YZ plane: the hole diameter is 10.0 mm. Cut a through-hole along the Y-axis at the center of the XZ plane: the hole diameter is 10.0 mm."
L1_50,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is an elbow composed of two orthogonal cylinders. Two cylinders with a diameter of 20 millimeters and a length of 50 millimeters are fused at a 90-degree angle at the ends, forming an L-shaped corner. The interior is not hollowed out, making it solid.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 20.0 mm) in the YZ plane, and extrude it 50.0 mm along the +X direction to form the first cylindrical segment. At the center of the end face of the first segment, create a datum plane parallel to the XZ plane, draw a circle of the same diameter, and extrude it 50.0 mm along the +Y direction. Use the merge/join or final Boolean union method to obtain the 90�� elbow fitting shape."
L1_51,"The Z-axis is the main axis/thickness direction; the X-axis is the length direction; the Y-axis is the width direction. This is a shape like a cookie with a bite taken out of it. It is a disc with a main diameter of 60 millimeters and a thickness of 10 millimeters. A cylindrical section with a diameter of 20 millimeters, centered at the edge, is cut out to form a crescent-shaped notch.","First, create a new part file and set the units to millimeters (mm). Establish a global coordinate system: use the origin (0,0,0) as the reference, with the default XY plane as the base sketch plane and the Z-axis as the upward direction. Draw a circle (diameter 60.0 mm) on the XY plane and extrude it by 10.0 mm to form a disc. On the top surface, draw a cutout circle (diameter 60.0 mm) and place its center on the edge of the outer circle, for example at (30.0,0). Perform an extruded cut through the entire thickness to create a notch."
L1_52,"The part has an overall appearance of a thin rectangular plate with rounded corners, and there is a long oval slot in the middle of the plate. The main base feature is a rectangular plate: with the center of the bottom surface as the origin, the length in the X direction is 120 millimeters, the width in the Y direction is 50 millimeters, and it is extruded to a thickness of 6 millimeters in the positive Z-axis direction. The extended feature is a central long oval through-slot: the center of the slot is at the origin, and the centerline is along the X-axis; the total length of the slot is 80 millimeters, the slot width is 18 millimeters, so the radius of the semicircles at both ends is 9 millimeters, and the slot runs through the thickness of the plate. The detailed feature is that the four corners of the plate are rounded with a fillet radius of 4 millimeters.","Create a new part with millimeters as the unit. Draw a center rectangle 120.0��50.0 in the XY plane sketch, exit the sketch and extrude 6.0 to generate the plate. Select the top surface for a sketch, use the ""Slot/Obround"" tool to create a through slot: total length 80.0, slot width 18.0, centered at the origin and along the X-axis. Exit the sketch, perform an extruded cut through to form the through slot. Finally, apply a fillet with a radius of 4.0 to the four outer corners, and confirm completion."
L1_53,"The overall appearance of the model is a cylindrical body with an elliptical cross-section, featuring a chamfered top edge and an offset through-hole. The main base feature is an elliptical cylinder: draw an ellipse in the XY plane with a major axis of 80 millimeters along the X direction and a minor axis of 50 millimeters along the Y direction, centered at the origin; extrude it 25 millimeters in the positive Z direction. The extended feature is a through-hole: the hole's axis is parallel to the Z-axis, with a diameter of 16 millimeters; the hole center is offset 10 millimeters in the positive X direction, placing the hole center at (10,0), and it runs through the entire height. The detailed feature is a 45-degree chamfer on the outer edge of the top ellipse, with a chamfer width of 0.8 millimeters.","Create a new part with millimeters as the unit. Draw an ellipse in the XY plane and label the major axis as 80.0 and the minor axis as 50.0, constraining the center to the origin; exit the sketch and extrude 25.0 to form an elliptical cylinder. Select the top face for a new sketch, draw a circle at point (10.0, 0.0) and label the diameter as 16.0 (use a horizontal dimension constraint to offset 10.0); exit the sketch and perform a cut-through to create a through hole. Finally, apply a 45�� chamfer to the outer edge of the top face ellipse, with a distance of 0.8, and confirm completion."
L1_54,"The overall appearance of the model is a spherical part with a through-hole at the center. The main feature is a sphere: the center of the sphere is at the origin (0,0,0), with a radius of 25 millimeters. The extended feature is a through-hole: the axis of the hole coincides with the Z-axis, the diameter of the hole is 14 millimeters, and the hole runs from the top to the bottom of the sphere. The detailed feature is that the intersection between the hole and the spherical surface remains sharp, without adding chamfers or fillets.","Create a new part with units in millimeters. Create a sphere: center at (0,0,0), radius 25.0. Create a cutting cylinder: axis along the Z-axis, radius 7.0, height set to 60.0 to ensure it passes through. Perform a Boolean difference: use the sphere as the target body and the cylinder as the tool body, confirm to obtain a perforated sphere."
L1_55,"The overall appearance of the model is a hollow frustum, with a larger base and a smaller top. The main body feature is a conical frustum: centered on the Z-axis, with the center of the base as the origin; the outer contour has a bottom outer diameter of 70 millimeters, a top outer diameter of 40 millimeters, and a height of 60 millimeters. The extended feature is a coaxial through-hole: the hole diameter is half of the top outer diameter, i.e., 40/2 = 20 millimeters, running through the entire height. The detailed feature is a 45�� chamfer on the outer edge of the base, with a chamfer width of 2 millimeters.","Create a new part with units in millimeters. Select the XZ plane for the sketch and draw a frustum section with the Z-axis as the axis of rotation: the outer radius transitions linearly from 35.0 at Z=0 to 20.0 at Z=60; the inner hole radius remains 10.0 throughout 0 to 60 and close the section. Exit the sketch, rotate 360�� around the Z-axis to generate a hollow frustum. Finally, apply a 45�� chamfer to the outer edge of the bottom surface with a distance of 2.0, and confirm completion."
L1_56,"The overall appearance of the model is a frustum-shaped block that is smaller at the top and larger at the bottom, with a square blind cavity in the center of the top surface. The main base feature is a frustum: the side length of the bottom square is 80 millimeters, the side length of the top square is 50 millimeters, and the height is 45 millimeters; the center of the bottom surface is located at the origin, with the Z-axis pointing upward, and the top and bottom squares are aligned in the same direction. The extended feature is a square blind cavity in the center of the top surface: the side length of the cavity is 30 millimeters, the depth is 15 millimeters (in the negative Z-axis direction), and it is concentric and aligned with the outer shape. The detailed feature is a 45-degree chamfer on the four edges of the top opening of the blind cavity, with a chamfer distance of 1 millimeter.","Create a new part with units in millimeters. First, draw a square base of 80.0��80.0 in the XY plane and extrude it by 45.0 to form the blank. Then, on the top surface, draw a concentric square of 50.0��50.0. Use loft or draft extrusion to connect the bottom 80.0 square to the top 50.0 square, forming a frustum shape. Select the top surface and enter sketch mode to draw a centered square of 30.0��30.0. Exit the sketch and extrude downward by 15.0 to create a blind cavity. Finally, apply a 45�� chamfer with a distance of 1.0 to the four edges of the cavity opening, and confirm completion."
L1_57,"The part has an overall appearance of an L-shaped bracket with a right-angled profile. The main body is a rectangular blank: centered at the bottom surface, with dimensions of 80��60��30 millimeters (X��Y��Z). The extended feature is formed by cutting out a rectangular notch to create the L-shape: a rectangular block is removed from the upper right rear corner of the blank, with the removed block having dimensions of 50��30��20 millimeters (along X��Y��Z), and the outer side of the removed block aligns with the +X, +Y, and +Z outer surfaces of the blank (i.e., the corner of the removed block is at (40,30,30)), thus leaving an L-shaped cross-section. The detailed feature is a fillet transition at the inner corner of the L-shape (the base corner of the notch), with a fillet radius of 4 millimeters.","Create a new part with millimeters as the unit. Draw a center rectangle 80.0��60.0 in the XY plane sketch and extrude 30.0 to generate the blank. Select the top face to enter the sketch, draw the notch rectangular profile: position it along the +X and +Y edges, with dimensions 50.0 (along X) �� 30.0 (along Y); exit the sketch, and extrude cut downward 20.0 to form an L-shaped notch. Finally, apply a fillet with a radius of 4.0 to the edges of the inner corners of the notch, and confirm completion."
L1_58,"The part has an overall appearance of a rectangular block with a through slot in the center of the top surface, forming a U-shaped slot structure. The main body is a cuboid: with the center of the bottom surface as the origin, the dimensions are 90��50��30 millimeters (X��Y��Z). The extended feature is a through slot in the center of the top surface: the centerline of the slot coincides with the X-axis, the slot width is 20 millimeters along the Y direction, the slot length is 90 millimeters along the X direction, and the slot depth is 12 millimeters cut downward. The detailed feature is a fillet at the intersection of the slot bottom and side walls (the two long edges), with a fillet radius of 2 millimeters.","Create a new part with millimeters as the unit. Draw a centered rectangle 90.0��50.0 in the XY plane and extrude it 30.0 to form a block. Select the top face for sketching, and draw a centered rectangular groove profile: length 90.0, width 20.0 (symmetric about the origin). Exit the sketch, and perform an extruded cut with a depth of 12.0 to form the groove. Finally, apply a fillet with a radius of 2.0 to the two long intersection lines at the bottom of the groove, and confirm completion."
L1_59,"The overall appearance of the model is a cylinder, with a circular groove in the middle of the outer surface. The main base feature is a solid cylinder: outer diameter 60 millimeters, height 80 millimeters, with the center of the bottom face as the origin and the axis coinciding with the Z-axis. The extended feature is an external circular groove: the groove center is located at Z=40 millimeters, with a groove width of 10 millimeters in the height direction (from Z=35 to 45), and a radial groove depth of 3 millimeters, making the groove bottom diameter 54 millimeters. The detailed feature is that the edges on both sides of the groove are rounded, with a fillet radius of 1 millimeter.","Create a new part with units in millimeters. In the XY plane, sketch a circle with a diameter of 60.0 and extrude it by 80.0 to form a cylinder. Select the XZ plane and enter sketch mode. Draw a rectangular section for a groove cut: in the radial direction from 30.0 to 27.0 (depth 3.0), and in the Z direction from 35.0 to 45.0 (width 10.0). Exit the sketch and use ""revolved cut"" around the Z-axis by 360�� to form the groove. Finally, apply a fillet with a radius of 1.0 to the circular edges on both sides of the groove, and confirm completion."
L1_60,"The overall appearance of the model is a circular flange plate with four mounting holes evenly distributed on the surface. The main base feature is a circular disk: outer diameter 100 millimeters, thickness 12 millimeters, with the center of the bottom face as the origin, stretched in the positive Z-axis direction. The extended features are four through-holes: hole diameter 10 millimeters, hole centers evenly distributed on a circle with a diameter of 70 millimeters (radius 35 millimeters), located at polar angles 0��, 90��, 180��, and 270��, i.e., the hole center coordinates are (35,0), (0,35), (-35,0), and (0,-35). The detailed feature is a uniform 45�� chamfer on the top edge of the four holes, with a chamfer width of 0.8 millimeters.","Create a new part with units in millimeters. Sketch a circle with a diameter of 100.0 on the XY plane and extrude it by 12.0 to form a disk. Select the top face for sketching, draw a construction circle with a radius of 35.0, and place four points aligned with the X/Y axes on it; draw circles at each point and dimension them with a diameter of 10.0. Exit the sketch and perform a cut-through to create four holes. Finally, apply a 45�� chamfer with a distance of 0.8 to the circular edges of the four holes on the top face, and confirm completion."
L2_1,"The shape is enclosed by concave surfaces. The overall appearance resembles an apple core that has been partially eaten. The base feature is a cube with an edge length of 50 mm. The extended features are created by cutting each of the four side faces with the lateral surface of a cylinder with a diameter of 60 mm. The topological logic transforms the flat sides of the cube into inwardly curved cylindrical surfaces, making the four vertical edges very sharp, and the horizontal cross-section becomes star-shaped. The overall structure is a column with four concave sides.","Initialize the modeling environment and select the XY plane to draw a square with a side length of 50 mm. Extrude the square 25 mm in both directions along the Z-axis to create a base cube. Select the front view plane and draw a circle with a diameter of 60 mm, with its center located in front of the origin, ensuring that the arc cuts into the solid. Perform a through-cut operation. Similarly, select the right view plane and draw a circle with a diameter of 60 mm, with its center located to the right of the origin, and perform a through-cut. Ensure that the cutting direction is perpendicular to the corresponding surface. Use the cylindrical side for a Boolean subtraction to remove material, forming a star-shaped column with four concave sides."
L2_2,"A cylinder passes through the edge of the sphere. The overall appearance is that the sphere has been bitten by the cylinder. The main base feature is a sphere with a radius of 40mm. The extended feature is a cylinder with a diameter of 30mm, whose axis is 25mm away from the center of the sphere. The detailed feature is that the cylinder penetrates the sphere. Topologically, because the eccentric distance plus the cylinder radius equals 40, one generatrix of the cylinder is tangent to the equator of the sphere, while the other side deeply cuts into the sphere. The resulting opening is a complex curved hole in the shape of a crescent. Overall, it is a sphere with an eccentric hole at the edge.","Create a part file and generate a sphere with a radius of 40 mm centered at the origin. Select the XY plane as the sketch reference and draw a circle with a diameter of 30 mm at X = 25 mm, Y = 0. Use the extrude cut command, select the full through option, and remove material along the Z-axis. Ensure that the cylinder axis is precisely offset by 25 mm from the center of the sphere to create a specific through-cut at the edge of the sphere."
L2_3,"First, cut the groove and then create the shape. The overall appearance is a hemisphere with a cross-shaped recess. The main base feature is a hemisphere with a radius of 40mm. An extended feature on the flat side of the hemisphere involves cutting a deep cross-shaped groove. The detailed feature requires that the groove cutting operation must consider the curved boundary of the hemisphere, and the ends of the groove are open. Topologically, the cross-shaped groove divides the hemisphere into four quadrant-like segments, but they remain connected at the bottom. The overall structure is a hemispherical base with a cross-shaped groove on top.","Select the front plane and draw a semicircle with a radius of 40mm, with the straight line at the top. Rotate 180 degrees to generate a hemisphere. Select the top plane of the hemisphere as the sketch reference, and draw two rectangles that are concentric and perpendicular to each other, both with a width of 10mm and lengths extending beyond the edge of the hemisphere. Use the extruded cut command to cut downward by 20mm. This step will form a cross-shaped open groove, dividing the upper part of the hemisphere into four petal-like regions."
L2_4,"This is a mechanical part with a base plate and a central bearing sleeve. The overall appearance is a square base with a raised circular ring. The main base feature is a 100x100mm square base plate, 15mm thick. The extended feature is a cylinder that merges vertically upward from the center of the base plate, with an outer diameter of 60mm, an inner diameter of 40mm, and a height of 40mm. The detailed features include four through-holes with a diameter of 10mm, distributed at the four corners of the base plate in an 80x80mm square pattern; the four corners of the base plate also have R10mm fillets. Overall, it is a standard four-hole flange mounting base.","Draw a 100x100mm center rectangle in the XY plane, extrude 15mm to create the base plate. Select the top surface of the base plate, draw a concentric circle sketch with an outer diameter of 60mm and an inner diameter of 40mm, and extrude 40mm upward to generate the main body of the bearing seat, ensuring that the center is a through hole. Again, select the top surface of the base plate, draw four circles with a diameter of 10mm, with the centers located at the vertices of a square with a side length of 80mm centered at the origin, and perform a full cut-through. Finally, select the four vertical edges of the base plate and apply a fillet feature with a radius of 10mm."
L2_5,"A single tube splits into two tubes, with an overall appearance resembling a slingshot-shaped pipe fitting. The main vertical tube has a diameter of 20mm. The extension feature smoothly bifurcates at the top into two branches, each with a diameter of 20mm, forming an angle of 60 degrees. The internal topology at the bifurcation point is a T-structure, requiring smooth transitions between three cylindrical surfaces and ensuring the connectivity of the internal cavity to avoid self-intersections. The entire structure is a Y-shaped T-fitting.","Use the scan or sweep function to build. First, sketch the path: draw the main path vertically upward from the origin, then branch into two paths at a 60-degree angle. Create a reference plane and draw a circular profile with a diameter of 20mm at the bottom of the main path, and draw circular profiles with a diameter of 20mm at the ends of the two branches. Generate the solid along the path and handle the smooth merging at the branching point. Finally, use the shell command, set a uniform wall thickness, and remove the three end faces to form an internally connected Y-shaped pipe."
L2_6,"Continuous grooves on the surface. The overall appearance is a shaft with threaded grooves. The main base feature is a cylinder with a diameter of 30mm and a length of 80mm. The extended feature has a helical groove cut into the surface with a semicircular cross-section, a pitch of 20mm, and 4 turns. The topological logic of the groove is to remove material along the helix, changing the surface topology of the cylinder to make it a non-simply connected surface. The whole is a large-pitch screw model.","Draw a circle with a diameter of 30 mm in the XY plane, and extrude it 80 mm to form a cylinder. Select the edge of the cylinder's end face as the starting point, define a helix with a pitch of 20 mm and 4 turns. Create a reference plane perpendicular to the starting point of the helix, and draw a semicircle sketch with a radius of 2 mm, where the straight edge of the semicircle fits against the surface of the cylinder, and the arc is inward. Use the sweep cut command, select the semicircle as the profile, and the helix as the path, to remove material along the surface of the cylinder, forming a continuous spiral groove."
L2_7,"This is a structure of a ring connected to a long rod, resembling a ring with a handle. The main body is a ring with an outer diameter of 60mm, an inner diameter of 30mm, and a thickness of 15mm. The extended feature is a rectangular rod with a cross-section of 20x15mm, extending radially from the outer side of the ring for a length of 80mm. At the other end of the rod, there is a through-hole with a diameter of 10mm, and the center axis of this hole is parallel to the axis of the large ring, but the center of the inner hole of the large ring is not at the geometric center of the ring; it is offset by 5mm towards the rod. The overall structure is an eccentric drive rod assembly.","In the XY plane, sketch a circle with a diameter of 60 mm centered at the origin. Draw a rectangle 80 mm long and 20 mm wide along the positive X-axis, tangent to and merging with the circle. Extrude 15 mm to create the main body. Select the top surface and draw a circle with a diameter of 30 mm at X = 5 mm, then perform an extruded cut. At the center of the end of the connecting rod, draw a circle with a diameter of 10 mm and also perform an extruded cut."
L2_8,"This is a set of steps arranged in a helical ascent. The overall appearance resembles a spiral staircase. The main base feature is a central column with a diameter of 20mm and a height of 100mm. The extended features are distributed around the column, consisting of 10 sector-shaped steps spiraling from bottom to top. Each step is 5mm thick, with a sector angle of 30 degrees and a radius of 50mm. The first step is at the bottom, and the last step is at the top. Adjacent steps are staggered by 10mm in height and 30 degrees in angle, forming a continuously ascending staircase. The whole structure is a model of a spiral staircase.","Stretch a 20mm diameter circle to a height of 100mm to create a central pillar. On the bottom surface, draw a sector sketch: inner diameter 10mm, outer diameter 50mm, and central angle 30 degrees. Extrude the sector by 5mm to create the first step. Use the array function to generate a total of 10 instances. Set the incremental parameters: each instance rotates 30 degrees around the Z-axis and is displaced 10mm along the Z-axis, thus constructing a spiral staircase structure around the pillar."
L2_9,"This is a circular ring with unidirectional teeth on the outer circumference. The overall appearance resembles a serrated wheel. The main body has a basic feature of an 80mm outer diameter, 50mm inner diameter, and 10mm thickness. The extended feature generates 12 ratchet teeth on the outer circumference. Each ratchet tooth consists of two lines: one is a straight line extending radially outward, and the other is a slanted line connecting the top of the tooth back to the root, with a tooth height of 5mm. These teeth are arrayed to form 12 in total. The entire structure is a toothed ring for a unidirectional ratchet mechanism.","Draw the base sketch: two concentric circles with diameters of 80mm and 50mm, extrude 10mm to form a ring. On the end face of the ring, draw a single ratchet tooth sketch: extend a 5mm straight line radially outward from a point on the outer circumference, then draw a slanted line back to the outer circumference to form a triangular tooth shape. Extrude this tooth shape 10mm to merge with the ring. Use the circular array command, select the tooth feature, set the number to 12, and distribute them evenly along the circumference to complete the ratchet modeling."
L2_10,"This is a part with two flanges erected on a base, forming an overall U-shaped support. The main base feature is a rectangular plate that is 80mm long, 40mm wide, and 10mm thick. The extended features are two flanges, each 40mm high, 40mm wide, and 10mm thick, which rise vertically from the left and right ends of the upper surface of the base, creating a U-shape in the side view. The detailed features include a 10mm diameter through-hole at the center of the left flange and a 10mm diameter through-hole at the center of the right flange, with a 20mm diameter and 2mm deep countersink around the hole on the right flange. Overall, it is an asymmetric dual-flange mounting base.","Select the front plane and draw a U-shaped cross-section sketch: the bottom is 80mm wide and 10mm high, and the two vertical sides are 10mm wide and 40mm high. Extrude 40mm to create a solid. Select the outer side of the left flange, draw a 10mm diameter circle, and cut through. Select the outer side of the right flange, draw a 10mm diameter circle and cut through, then draw a 20mm diameter circle concentrically and cut to a depth of 2mm, forming an asymmetric countersunk hole structure."
L2_11,"The internal channels form a loop. The overall appearance is a solid block with two holes. The base feature of the body is a 60x40x40mm rectangular prism. The detailed features include two 10mm diameter holes on the top surface, spaced 30mm apart. The extended feature is that these two holes are connected internally by a horizontal lateral channel, forming a U-shaped loop. The topological logic is that water poured into one hole can flow out from the other, creating a communicating vessel structure, requiring the description of an invisible internal lateral excavation. The whole is a module with an internal U-shaped flow channel.","Draw a 60x40mm rectangle and extrude it 40mm to form a rectangular prism. On the top surface, draw two circles with a diameter of 10mm, spaced 30mm apart, and cut blind holes 30mm deep. Select a side face, draw a circle with a diameter of 10mm, and extrude inward to cut, with a depth sufficient to penetrate both vertical blind holes, thus forming an internal U-shaped connected channel."
L2_12,"This is a flange with conical protrusions on its surface. The overall appearance is a circular disc with three protruding frustums. The main base feature is a disc with a diameter of 100mm and a thickness of 10mm. The extended features are three frustums evenly distributed around the center on the upper surface of the disc. The detailed features include each frustum having a base diameter of 20mm, a top diameter of 10mm, and a height of 15mm, with a through-hole of 5mm in diameter at the center of each frustum, passing through the entire part. The whole assembly serves as a three-point support mounting base.","Stretch a 100mm diameter circle to create a 10mm thick base. Create a reference plane 15mm above the top surface of the base. Use the loft boss command: select the bottom profile on the top surface of the base with a diameter of 20mm; select the top profile on the new reference plane with a diameter of 10mm. After generating a frustum, use a circular array to replicate it three times. Finally, draw a 5mm diameter circle at the center of each frustum and perform a full cut-through to penetrate the frustum and the base."
L2_13,"This is a hollow structure based on a regular polyhedron, with an overall appearance of a football-shaped frame. The main base feature is a regular dodecahedron with a circumscribed sphere radius of 30mm. The extended features involve removing cylindrical through-holes at the center of each of the twelve pentagonal faces, with the hole diameter allowing adjacent holes to connect internally. The detailed features include retaining all edges while hollowing out the centers of the faces, forming a skeletal structure. Overall, it is a complex mathematical geometric framework.","Generate a solid dodecahedron with an outer sphere radius of 30 mm. Select one of the pentagonal faces, create a sketch, and draw a central circle. Extrude and cut inward until it reaches the center or penetrates through. Using the symmetry axis of the geometry, apply a circular array or feature duplication function to replicate this cutting operation on the remaining 11 faces, ensuring that the internal cavities are connected, leaving only the edge skeleton."
L2_14,"This is a classic hollow structure. The overall appearance is a frame composed of edges. The main base feature is a cube with an edge length of 60mm. Extended features include square through-holes with an edge length of 40mm, centered on each face and extending along the X, Y, and Z axes. The detailed feature is that the square holes in the three directions fully intersect at the center. The topological logic results in the remaining solid parts forming 12 edges, transforming the object from a simply connected to a multiply connected structure, with a large cubic cavity formed at the center. The entire structure is a cubic frame that retains only the edge skeleton.","Draw a cube with an edge length of 60 mm. Select the center positions of the front, top, and right views, and draw a square sketch with a side length of 40 mm. Perform a full-through extruded cut command in sequence. The cuts in the three directions will intersect at the center of the cube, removing the core material, and ultimately resulting in a frame structure composed of 12 edges."
L2_15,"This is a disc with radial slots. The overall appearance is similar to the driven wheel of a Maltese cross mechanism. The main body feature is a disc with a diameter of 80mm and a thickness of 10mm. The extended features are four U-shaped radial straight slots, each 8mm wide and 25mm long, evenly distributed along the edge of the disc. The slots face outward, with a semicircular bottom, and the slot depth points toward the center. The detailed features include a semicircular cutout with a radius of 20mm on the circumference between every two straight slots. There is a central shaft hole with a diameter of 10mm. Overall, it is a four-position ratchet part.","Stretch a disc with a diameter of 80mm and a thickness of 10mm. Draw a U-shaped groove sketch on the top surface of the disc and cut through it. In the adjacent quadrant, draw a semicircular cutout with a radius of 20mm along the circular edge and cut through it. Circularly array these two features four times around the center of the circle. Finally, draw a circle with a diameter of 10mm at the center and cut through it."
L2_16,"This is a pipe fitting with a central bulge. The overall appearance features a sphere in the middle and connecting pipes around it. The main body has a central feature, which is a 50mm diameter sphere. The extended features include four cylindrical nozzles, each with a diameter of 30mm and a length of 20mm, protruding in a horizontal cross direction. The detailed features include internal passages: a 20mm diameter through-hole along the X-axis and a 20mm diameter through-hole along the Y-axis, with the four pipes converging at the center of the sphere. Additionally, a 20mm diameter flat surface is cut from the top of the sphere. The entire piece is a rough casting for a four-way ball valve housing.","Rotate to generate a sphere with a diameter of 50mm. In the XY plane, along the positive and negative directions of the X-axis and Y-axis, respectively, extrude four cylinders with a diameter of 30mm and a length of 20mm. Draw circles with a diameter of 20mm along the X-axis and Y-axis, and perform a full cut-through to make the interior connected. Select the top of the sphere and remove some material to form a circular platform with a diameter of 20mm."
L2_17,"This is a structure where a smaller tube is placed inside a larger tube and connected by ribs. The overall appearance is of concentric tubes with connecting ribs in the middle. The main base features are as follows: Outer tube: outer diameter 80mm, inner diameter 70mm, length 50mm. Inner tube: outer diameter 40mm, inner diameter 30mm, length 50mm. The extended feature is that the outer tube and inner tube are placed coaxially. The detailed feature is that the two tubes are connected by four rectangular ribs, each 5mm thick, distributed radially, filling the gap between the two tubes, with an axial length equal to the tube length. The overall structure is the housing of an axial flow fan.","In the XY plane, draw a composite sketch: two concentric annular rings and four rectangular stiffeners connecting the inner and outer tubes. Use the trim tool to remove overlapping lines, forming a unified closed multi-connected section. Extrude 50mm along the Z-axis to generate the entire structure, including the inner and outer tubes and the connecting stiffeners, in one operation."
L2_18,"This is a long block with a semicircular slide. The overall appearance is a rectangular prism with a central depression. The main body has a length of 100mm, width of 40mm, and height of 30mm. An extended feature on the upper surface along the length direction is a semicircular groove that runs the entire length. Detailed features include two rectangular weight-reduction grooves, each 60mm long and 10mm high, cut into the sides of the slide, with a depth of 5mm. The whole is a lightweight rail slider.","Stretch a rectangular prism of 100x40x30mm. Select the end face, and draw a semicircle with a radius of 15mm at the center of the upper edge, cutting through the entire length. Select the side face, and draw a 60x10mm rectangular sketch, centered, and cut inward to a depth of 5mm. Use the mirror function to replicate the side groove feature to the other side."
L2_19,"The cavity is divided. The overall appearance is a tube with a cross inside. The main body has a basic feature of an outer diameter of 40mm, an inner diameter of 30mm, and a length of 50mm. The extended feature inside the tube integrates a 2mm thick cross-shaped flat plate that runs the entire length of the tube. The topological logic of the cross plate divides the cylindrical inner cavity of the tube into four independent fan-shaped channels. The whole structure is a four-channel diverter tube.","Draw an outer circle with a diameter of 40mm in the XY plane. Inside, draw a cross-shaped rectangle with endpoints extending to the circumference, and trim the remaining parts to form four fan-shaped holes. Alternatively: Draw an outer circle D40 and an inner circle D30, along with a cross brace, and extrude 50mm. Ensure that the cross brace connects to the outer tube wall, dividing the inner cavity into four independent channels."
L2_20,"The axis of the hole is not parallel to any reference axis. The overall appearance is a square block with an inclined hole. The base feature is a cube with an edge length of 50mm. An extended feature establishes an axis connecting the vertices of the cube's body diagonal. A detailed feature involves drilling a circular through-hole with a diameter of 10mm along this axis. The topology and logic of the hole are such that the entry and exit shapes are not circular but complex, elliptical, stretched cuts, and the hole walls are helical or inclined cylindrical surfaces internally. Overall, it is a cube with a hole along its body diagonal.","Stretch a cube with an edge length of 50mm. Create a 3D sketch and draw a straight line connecting the diagonal vertices of the cube. Establish a reference plane perpendicular to this line. On this reference plane, draw a circle with a diameter of 10mm. Use the extruded cut command to completely penetrate the cube along the diagonal direction."
L2_21,"The sphere is embedded in the plate. The overall appearance shows a bulge on the plate. The main base feature is a flat plate measuring 100x100x10mm. The extended feature is a sphere with a diameter of 40mm, with its center located on the upper surface of the plate. Topologically, the lower half of the sphere is buried within the plate, while the upper half is exposed. If the bottom surface of the plate is cut flat, the bottom of the sphere will be cut off, forming a circular exposed surface. Since the plate thickness of 10mm is less than the radius of 20mm, the bottom of the sphere will protrude from the bottom of the plate. If a flat cut is required, the removal of the bottom surface must be described. Overall, it is a decorative plate with an embedded sphere.","Stretch a base plate with dimensions 100x100x10mm. Select the center of the top surface of the base plate as the center of the sphere, and rotate to generate a sphere with a radius of 20mm, checking ""merge results."" At this point, the lower half of the sphere is embedded in the plate and protrudes below the bottom of the plate. Choose the bottom surface of the base plate as the reference, draw a rectangle or circle larger than the sphere, and stretch it downward to cut out, in order to flatten the part of the spherical cap that protrudes below the bottom of the plate, keeping the bottom surface flat."
L2_22,"The chamfer compromises the integrity of the hole. The overall appearance is a square block with a missing corner and a hole. The base feature is a cube with an edge length of 40mm. The detailed feature includes a through-hole with a diameter of 30mm at the center. The extended feature involves cutting a 10x10mm chamfer on the four vertical edges of the cube. Due to the large hole diameter and the large chamfer, the chamfer cut will penetrate the hole wall, causing the hole to break open on the sides, forming four open side slots instead of a closed hole. The overall shape is an irregular hub open on the sides.","Stretch a 40mm cube. Cut a through-hole with a diameter of 30mm at the center position. Select the four vertical edges of the cube and apply the chamfer command, setting the chamfer distance to 10mm. Since the wall thickness of the hole is only 5mm, and the chamfer depth is 10mm, the chamfer operation will cut through the hole wall, forming a structure with side openings."
L2_23,"This is a transition piece connecting a square tube and a round tube. The lower part of the overall appearance is square, and the upper part is round. The base feature of the main body is a square column with a side length of 50mm and a height of 20mm; the top is a cylindrical column with a diameter of 30mm and a height of 20mm, with a 20mm high transition section between them. The detailed features include that the entire part is hollow with a uniform wall thickness of 2mm, forming a continuous funnel-shaped pipe. This is a common round-to-square transition fitting in HVAC systems.","Create three datum planes: Plane 1, Plane 2, and Plane 3. Draw a 50x50 rectangle on Plane 1, draw the same rectangle on Plane 2, and draw a circle with a diameter of 30 mm on Plane 3. Use the loft command to connect the rectangle on Plane 2 and the circle on Plane 3, generating a transition section. Extrude a 20 mm square column at the bottom and a 20 mm cylindrical column at the top. Finally, use the shell command to remove the top and bottom faces, setting the wall thickness to 2 mm."
L2_24,"This is a structure that appears to be closed or semi-closed, with a larger internal cavity. The overall appearance is that of a bottle-shaped body with a narrow neck. The main external feature is a cylinder with a diameter of 40mm and a height of 60mm. The extended internal feature is a spherical cavity with a diameter of 30mm, with its center located at the geometric center of the cylinder. A detail feature is a through-hole with a diameter of only 10mm on the top surface of the cylinder, connecting to the internal spherical cavity. The internal cavity has a diameter much larger than the opening, and the shape of the cavity is different from the exterior, requiring the accurate creation of the internal negative volume. Overall, it is a model of a narrow-necked, large-bellied container.","Draw a rotated section sketch on the front plane: the outer contour is a 20x60mm rectangle, and the inner contour is a semicircle with a radius of 15mm. The top is connected by a 5mm wide passage between the inner and outer contours, and the bottom is closed. Rotate 360 degrees around the central axis to generate a cylindrical solid with a spherical inner cavity and a constricted opening in one operation."
L2_25,"This is a reinforced three-sided corner connector. The overall appearance is an internal angle structure formed by three planes perpendicular to each other. The main base features are composed of three 50x50x5mm square plates, each joined perpendicularly along the XY, YZ, and XZ planes, sharing a common vertex. The extended features at the inner junctions of the three plates do not have complex chamfers but instead have simple geometric holes: each plate has a 15mm diameter through-hole at its center. The detailed features include three triangular reinforcing ribs with side lengths of 20mm and a thickness of 5mm, added at each of the three inner right angles, connecting the adjacent plates. Overall, it is a heavy-duty box corner fitting.","Stretch three 50x50x5mm plates and join them along the positive X, Y, and Z axes to form an internal angle structure. Cut a 15mm diameter hole at the center of each plate. At each of the three internal right-angle corners, create a reference plane or use the rib command to draw a triangular contour with right-angle sides of 20mm, extrude to a thickness of 5mm, and place it centrally to connect the adjacent plates, enhancing the structural rigidity."
L2_26,"This is a tabletop structure supported by four legs, resembling a small square table. The main feature is a square top plate measuring 100x100x5mm. Extending features are located on the inner sides of the four corners beneath the top plate, each connected to four cylindrical legs with a diameter of 10mm and a height of 50mm. The bottom of the four legs is connected to a shared base, which is a square frame with an outer diameter of 100mm, an inner diameter of 80mm, and a thickness of 5mm. The overall structure is a miniature table with a double-layered frame.","Stretch a top plate of 100x100x5mm. On the lower surface of the top plate, draw four circles with a diameter of 10mm, each 10mm away from the four corner points. Extend these circles downward by 50mm to form table legs. On the bottom plane of the table legs, draw a square ring sketch with an outer frame of 100x100mm and an inner frame of 80x80mm. Extend this sketch downward by 5mm to form the base frame, completing the double-layer connection structure."
L2_27,"The internal channel shape has changed. The overall appearance is cylindrical. The main body has a basic feature with an outer diameter of 30mm and a length of 50mm. The detailed features include an internal through-hole composed of two segments: the upper segment is a hexagonal hole 25mm deep, and the lower segment is a circular hole 25mm deep. At the junction of the holes, the hexagon intersects with the circle. Since the circumscribed circle of the hexagon is larger than 15mm in diameter and the inscribed circle is equal to 15mm, six small crescent-shaped steps are formed at the junction. Overall, it is a sleeve with a sudden change in the internal hole shape.","Stretch a cylinder with a diameter of 30 mm and a length of 50 mm. Select the top surface, draw a regular hexagon with an inscribed circle diameter of 15 mm, and cut down 25 mm. Select the bottom surface, draw a circle with a diameter of 15 mm, and cut down 25 mm through the remaining part. Note the geometric transition between the hexagonal corners and the circular hole wall at the intersection depth."
L2_28,"The object contains a suspended element. The overall appearance is a hollow cube with a smaller cube inside. The main feature is a hollow cube with an edge length of 60mm. Inside the hollow cavity, at the center, there is a solid small cube with an edge length of 20mm. To illustrate the physical connection, the center of each face of the small cube is connected to the inner wall of the outer shell by cylindrical rods with a diameter of 2mm. The topology consists of two layers, inner and outer, connected by extremely thin ""bridges,"" testing the description of multiple entities and their minute connections. The whole structure is a hollow box containing a core block.","Stretch a cube with an edge length of 60mm. Use the shell command, remove no faces, set the wall thickness to 5mm, and retain the internal cavity. Create a new solid at the center, stretching a small cube with an edge length of 20mm. Draw circles with a diameter of 2mm at the center of each of the six faces of the small cube, and stretch them until they touch the inner wall of the shell. Merge the internal and external solids into a single connected component."
L2_29,"This is a circular ring with teeth on the inner circumference. The overall appearance is smooth on the outside and toothed on the inside. The main body is a disc with an outer diameter of 100mm and a thickness of 20mm. An extended feature involves cutting out a hole with a diameter of 60mm at the center of the disc. The detailed feature consists of 12 rectangular teeth growing towards the center from the inner wall of the hole, each tooth being 5mm wide and 5mm high, evenly distributed around the circumference. The whole is a model of an internal spline or internal gear ring.","Stretch a ring with an outer diameter of 100mm, an inner diameter of 60mm, and a thickness of 20mm. On the end face of the ring, sketch a single tooth: a rectangle 5mm wide, extending 3mm from the edge of the inner hole towards the center. Extrude this rectangle 20mm to merge with the ring. Use the circular array command to replicate this tooth feature 12 times around the center, forming a complete internal gear ring."
L2_30,"An object with a hollowed-out bottom, resembling a pier in overall appearance. The main body is a rectangular prism measuring 60x30x30mm. An extended feature involves cutting out a semi-cylindrical shape along the long axis on the bottom surface. Detailed features include holes drilled vertically through the object. The topological logic of the bottom cut means that the object only contacts the ground at its four corners, while the vertical holes pass through the arch. Overall, it is a support block with an arched bottom.","Stretch a rectangular prism measuring 60x30x30mm. Select the front view plane, and draw a semi-elliptical sketch at the center of the bottom edge. Perform a full cut through to the back to form an arched bottom. Select the center of the top surface, and draw a circular sketch. Perform a full cut downward."
L2_31,"The geometric challenge of creating a square hole on a spherical surface. The overall appearance is a hollow sphere with square windows. The main base feature is a hollow spherical shell with an outer diameter of 50mm and an inner diameter of 40mm. The extended feature involves cutting a 20x20mm square through-hole along the X-axis on the surface of the spherical shell. The topological logic is that the square plane is projected onto the spherical surface, and the edges of the cut are four arcs in three-dimensional space rather than straight lines. This tests the understanding of projection cutting. The overall structure is a spherical shell with a square window.","Rotate to generate a hollow spherical shell with an outer diameter of 50mm and an inner diameter of 40mm. Create a reference plane perpendicular to the X-axis and located outside the sphere. Draw a 20x20mm square on this plane, centered on the X-axis. Use the extrude cut command, select ""through all,"" project the square profile, and cut through the spherical shell wall to form a square window at the curved edge."
L2_32,"The array units overlap with each other. The overall appearance is petal-like. The main base feature consists of an array of six cylinders, each with a diameter of 20mm, arranged around the origin, with their axes on a circle with a diameter of 20mm. Due to the small diameter of the array circle and the larger diameter of the cylinders, there is significant overlap and interference between adjacent cylinders, and the center may be completely filled or have only very small gaps. After the six cylinders merge, they form a single entity with an outer edge resembling a plum blossom. The overall structure is a plum blossom column.","On the XY plane, draw a circle with a diameter of 20 mm at X = 10 mm. Use the circular sketch array tool to replicate it 6 times, centered at the origin. At this point, the circles will overlap. Select the internal areas of all the circles and extrude them to a certain height. Alternatively: first extrude a cylinder, then use a circular feature array and combine the solids. The result should be a column with an outer profile resembling a plum blossom."
L2_33,"This is a plate with multiple inclined slots. The overall appearance is a square plate with an exhaust grille. The main base feature is a 100x100x5mm thin plate. The extended features are in the central area of the plate, with five parallel rectangular through-slots, each 80mm long and 10mm wide, spaced 5mm apart. Detail features: Each slot is not cut vertically but includes a water deflector structure��specifically, a sloping deflector plate extending outward from the upper edge of each slot, measuring 80mm long, 12mm wide, and 2mm thick. The whole assembly is a ventilation cover plate with rainproof blades.","Stretch a 100x100x5mm base plate. Use a louver forming tool or manual modeling: cut an 80x10mm slot on the plate, and create a reference plane at the upper edge of the slot. Draw a baffle profile with a width of 12mm and a thickness of 2mm, and extrude it at a 45-degree angle. Use a linear array to replicate the slot and baffle feature 5 times along the Y-axis with a spacing of 15mm, forming a vent grille."
L2_34,"A feature that divides an object into two critical states. The overall appearance is an axis that is thinner in the middle and thicker at both ends. The main base feature is a cylinder with a diameter of 20mm and a length of 50mm. An extended feature is a circumferential groove, 5mm wide and 9mm deep, cut radially into the middle of the cylinder. The detailed feature has a cylinder radius of 10mm, a cut depth of 9mm, and the remaining connecting shaft diameter is only 2mm. Topological logic indicates that if the cut depth reaches 10mm, the object will break into two parts. This case tests the limit control of the ""remaining material"" connectivity. The whole is a deeply grooved connecting shaft.","Create a cylinder with a diameter of 20mm and a length of 50mm. In the front view plane, draw a rectangular cut sketch: 5mm wide, centered; the inner edge of the rectangle is 1mm from the axis. Rotate the rectangle 360 degrees to cut, forming a deep groove, leaving only a 2mm diameter central connecting shaft."
L2_35,"The model studies the ""near miss"" or partial connection of two cylindrical holes inside. The overall appearance is a cube with holes on its surface. The main feature is a cube with an edge length of 60mm. The detailed features include a through-hole with a diameter of 20mm along the X-axis, with its axis located on the Z=5mm plane; and a through-hole with a diameter of 20mm along the Y-axis, with its axis located on the Z=-5mm plane. Due to the fact that the axes of the two holes are only 10mm apart in the Z-axis direction, and the sum of their radii is 20mm, the two through-holes partially overlap and interconnect inside the cube, forming a complex internal window rather than a simple cross. Overall, it is a cube with eccentrically intersecting internal channels.","Stretch a 60mm cube. Select the right view plane and draw a 20mm diameter circle at Z=5mm, then cut through completely along the X-axis. Select the front view plane and draw a 20mm diameter circle at Z=-5mm, then cut through completely along the Y-axis. Since the vertical distance between the axes of the two holes is less than the sum of their diameters, ensure that the two holes correctly intersect internally to form a complex intersecting cavity."
L2_36,"This is a flange ring with multiple counterbore holes. The overall appearance is a thick-walled circular ring. The main base feature has an outer diameter of 120mm, an inner diameter of 80mm, and a thickness of 20mm. The extended features are six evenly distributed counterbore holes on a pitch circle with a diameter of 100mm. Each hole consists of two parts: the upper part is a cylindrical hole with a diameter of 10mm and a depth of 10mm, and the lower part is a through-hole with a diameter of 6mm. Overall, it is a flange ring with six fixed holes.","Stretch a ring with an outer diameter of 120mm, an inner diameter of 80mm, and a thickness of 20mm. Draw a construction circle with a diameter of 100mm on the top surface. Define a point on the construction circle and use the non-standard hole wizard or revolved cut to create a countersunk hole: the countersink diameter is 10mm and the depth is 10mm, with a through-hole diameter of 6mm. Use a circular array to replicate this hole feature six times, evenly distributed on the PCD."
L2_37,"The model is a connected structure with a central sphere extending cylinders in six directions. The overall appearance resembles a three-dimensional coordinate axis molecular structure. The main feature is a central sphere with a radius of 20mm. The extended features are six cylindrical cantilevers, each with a diameter of 15mm and a length of 30mm, growing along the positive and negative directions of the X, Y, and Z axes. The detailed features include a blind hole with a diameter of 8mm and a depth of 10mm at the center of the end of each of the six cylinders, and the sphere is solid inside. The entire structure forms a spatial node connector with six external interfaces.","Create a sphere with a radius of 20mm. Extrude six cylinders, each with a diameter of 15mm, in the positive and negative directions along the X, Y, and Z axes, with a length of 30mm from the center of the sphere outward. Merge all the solids. Select the end faces of the six cylinders, and draw circles with a diameter of 8mm on each. Cut inward to a depth of 10mm to form blind holes."
L2_38,"This is a fully interconnected cross pipe fitting. The overall appearance consists of two cylindrical pipes intersecting perpendicularly. The main features are a horizontal cylindrical pipe with a diameter of 50mm and a length of 120mm, and a vertical cylindrical pipe with a diameter of 50mm and a length of 80mm. The extended feature is that the centers of the two pipes coincide and merge. The detailed features include a shelling or drilling operation on the entire model, resulting in a through-hole diameter of 40mm along the X-axis and a through-hole diameter of 40mm along the Z-axis, both of which fully intersect at the center, forming a cross-shaped cavity. The whole assembly is a four-way pipe fitting.","In the front view plane, draw two vertically intersecting circles: extrude a cylinder with a diameter of 50mm and a length of 120mm along the X-axis, and extrude another cylinder with a diameter of 50mm and a length of 80mm along the Z-axis, with the midpoints of both cylinders coinciding. Perform a Boolean union. Select all four circular end faces, draw a circle with a diameter of 40mm, and perform an extruded cut to the center, ensuring that the internal cavity is fully connected, forming a cross-shaped tube with uniform wall thickness."
L2_39,"This is a part with a beveled surface that has a hole. The overall appearance is a right-angled trapezoidal block. The base feature has a bottom surface of 60x40mm, a rear height of 40mm, and a front height of 10mm, forming a wedge. The extended feature is on the beveled surface, where a rectangular blind slot 30mm long, 15mm wide, and 10mm deep is milled, perpendicular to the beveled surface. The detailed feature is a through-hole with a diameter of 8mm, drilled at the center of the bottom of the slot, perpendicular to the beveled surface, penetrating to the base. The entire part is a beveled positioning fixture.","Draw a right trapezoid in the front view plane: base 60mm, rear vertical side 40mm, front vertical side 10mm, and connect the slanted side. Extrude 40mm wide to form a wedge. Select the beveled face as the sketch reference, draw a 30x15mm rectangle, and cut 10mm downward perpendicular to the beveled face. Draw an 8mm diameter circle at the center of the bottom plane of the slot, and cut through the entire solid vertically downward."
L2_40,"This is a cylinder with a surface covered in rhombic protrusions, designed as an anti-slip handle. The main body is a cylinder with a diameter of 30mm and a length of 60mm. Extended features include bidirectional helical cutting on the cylindrical surface. The first set consists of right-handed 45-degree helical V-grooves, with a groove depth of 1mm and a pitch of 2mm; the second set consists of left-handed 45-degree helical V-grooves with the same parameters. The detailed feature is that the two sets of helical grooves intersect, dividing the original cylindrical surface into countless tiny rhombic pyramid protrusions. Overall, it is a mechanical part with standard knurling.",Stretch a cylinder with a diameter of 30 mm and a length of 60 mm. Create a helical path. Draw a V-shaped notch profile. Perform a sweep cut along the helical path and create the first set of patterns by circular array around the axis. Repeat the steps to create a reverse helical groove and array. The two sets of grooves intersect to form a diamond mesh knurled surface.
L2_40,"This is a cylinder with a surface covered in rhombic protrusions, designed as an anti-slip handle. The main body is a cylinder with a diameter of 30mm and a length of 60mm. The extended features involve bidirectional helical cutting on the cylindrical surface. The first set consists of right-handed 45-degree helical V-grooves, with a groove depth of 1mm and a spacing of 2mm; the second set consists of left-handed 45-degree helical V-grooves with the same parameters. The detailed features are formed by the intersection of the two sets of helical grooves, dividing the original cylindrical surface into countless tiny rhombic pyramid protrusions. Overall, it is a mechanical part with standard knurling.",Stretch a cylinder with a diameter of 30 mm and a length of 60 mm. Create a helical path. Draw a V-shaped groove profile. Perform a sweep cut along the helical path and create the first set of textures by circular array around the axis. Repeat the steps to create a reverse helical groove and array. The two sets of grooves intersect to form a diamond mesh knurled surface.
L2_41,"This is a crystal-like column with a complex shape. The overall appearance is based on a truncated octagonal prism. The main body is a regular octagonal prism with a circumscribed circle diameter of 40mm and a height of 60mm. At the top of the column, an extension feature is created by cutting with a 45-degree conical surface, forming a pointed top. A detailed feature is a rectangular groove, 5mm wide and 2mm deep, cut horizontally around the middle of the column. Overall, it is a decorative architectural capital model.","In the XY plane, draw a regular octagon with a circumscribed circle diameter of 40mm, and extrude it by 60mm. Select the front view plane, and at the top corner, draw a triangular cutting profile at a 45-degree angle. Use the central axis as the rotation axis to perform a revolved cut, sharpening the top. At the midpoint height of the cylinder, draw a rectangular profile 5mm wide and 2mm from the edge, and perform a revolved cut to create an annular groove."
L2_42,"This is a right-angle connecting bracket with triangular reinforcement. The overall appearance is L-shaped, with a support plate on the inside. The main body is formed by vertically joining two rectangular plates, each measuring 100x60x10mm, to create an L-shape. At the inner right angle of the L-shape, a 10mm thick right-angled triangular reinforcement is centered, with each leg of the triangle, measuring 50mm, fitting against each of the two plates. In the center of both the vertical and horizontal plates, there is a through-hole with a diameter of 20mm. Overall, it is a typical rib-reinforced corner bracket.","Draw an L-shaped cross-section (one side 100x10mm, the other side 100x10mm, joined perpendicularly), and extrude it 60mm wide. Create a middle reference plane. Draw a triangular sketch with a right-angle side length of 50mm, connecting the inner right-angle walls, and center it. Use the rib or extrude command to create a rib with a thickness of 10mm. Draw circles with a diameter of 20mm at the center of both the vertical and horizontal plates of the L-shape, and cut through holes."
L2_43,"The square hole perfectly accommodates the cylinder. The overall appearance is a square frame enclosing a cylinder. The main base feature is a square frame with an outer side length of 60mm and an inner hole side length of 40mm. The extended feature is a cylinder with a diameter of 40mm, centered within the square hole, and with a height of 20mm. The topological logic is that the cylinder's diameter equals the side length of the square hole, so the four generatrices of the cylinder are ""tangentially in contact"" with the four flat walls of the square hole. In CAD, when this contact is handled as a single entity, the connection is a zero-thickness line. The overall structure is a solid with a cylinder fully inserted into the square hole.","Draw a square with a side length of 60 mm in the XY plane and extrude it by 20 mm. On the top face, draw a centered square with a side length of 40 mm and cut through to form a frame. Again on the top face, draw a centered circle with a diameter of 40 mm, extrude it by 20 mm, and check ""Merge Results."" At this point, the cylindrical side contacts the inner wall of the frame at four tangent points, forming a solid where the frame tightly encloses the cylinder."
L2_44,"This is a heat sink with parallel fins on the top. The overall appearance is a square block that is solid at the bottom and comb-like at the top. The base of the main body is a flat plate measuring 60x60x10mm. The extended features consist of 10 vertical fins arranged along the X-axis above the base. Each fin is 60mm long, 40mm high, and 2mm thick, with a spacing of 4mm between each fin. All the fins are integrated with the base. The whole assembly is a model of a heat sink for electronic devices.","Stretch a 60x60x10mm base plate. On the upper surface edge of the base plate, draw the first fin sketch: a 60x2mm rectangle. Extrude the height to 40mm. Use the linear array command to copy 10 instances along the X-axis, setting the spacing to /9 or specifying the spacing to ensure the fins are evenly distributed on the base and merge them into a single body."
L2_45,"This is a flexible hose with a wavy wall. The overall appearance resembles an accordion or the bent part of a straw. The basic characteristics are a 100mm long, thin-walled tube with an average diameter of 40mm and a wall thickness of 2mm. The extended feature is that the tube wall is not straight but fluctuates in a sine wave along the axial direction. The peak diameter is 45mm, the trough diameter is 35mm, the wavelength is 10mm, and there are 10 cycles. The detailed features include the same wavy shape inside the tube, maintaining a uniform wall thickness, with 5mm long straight sections at both ends for connection. Overall, it is a typical hydraulic bellows.","In the front view plane, draw the rotational section of the corrugated pipe: Draw a centerline 100mm long. Draw the wavy line for the pipe wall, with the crest 22.5mm from the axis and the trough 17.5mm from the axis, with a wavelength of 10mm, repeated 10 times. Use the offset solid command to create the inner wall profile by offsetting 2mm inward, and close both ends. Rotate 360 degrees around the central axis to generate the solid model of the corrugated pipe."
L2_46,"The two hemispheres are offset and fused. The overall appearance is similar to the shape of a peanut. The main body features two hemispheres with a radius of 30mm each. The extension feature involves the flat surfaces of the two hemispheres facing each other but not overlapping. The center of the left hemisphere is at one point, and the center of the right hemisphere is at another, with a distance of 0 between the two planes. Due to the misalignment of the centers, the overlapping area of the two circular planes is non-circular, and the edge of the fused solid presents an ""8""-shaped contour change rather than a smooth spherical surface. Overall, it is a misaligned, joined spherical assembly.","Create the first entity: generate a hemisphere with a radius of 30mm, centered at the origin, with the flat face oriented towards the positive Z-axis. Create the second entity: generate a hemisphere with a radius of 30mm, centered at the origin, with the flat face oriented towards the negative Z-axis. Perform a Boolean union operation to merge the two offset hemispheres into a single entity, forming an ""8""-shaped waist."
L2_47,"This is a pipe fitting with a central baffle. The overall appearance resembles a bamboo joint. The main body is a tube with an inner diameter of 20mm, an outer diameter of 30mm, and a length of 100mm. At both ends of the tube, there are flanges with a diameter of 50mm and a thickness of 5mm. In the exact center of the tube, there is a central baffle with a diameter of 40mm and a thickness of 5mm. All flanges and the tube are coaxially integrated. The entire assembly is a hydraulic pipe fitting with dual-end and central fixation.","Use the revolve command to form the shape in one step. Draw a profile sketch in the front plane: include a tube body contour with a length of 100mm and a wall thickness of 5mm; add flange rectangles with a height of 10mm and a width of 5mm at both ends; add a retaining ring rectangle with a height of 5mm and a width of 5mm in the middle. After closing the profile, revolve it 360 degrees around the central axis to generate the solid."
L2_48,"Study the cross-sectional shape after a sphere is removed from the corner of a cube. The overall appearance is a cube with a missing corner. The main feature is a cube with an edge length of 50 mm. An extended feature is created at one of the eight vertices of the cube, with a sphere of radius 30 mm centered at that vertex. A Boolean subtraction operation is performed, removing the sphere from the cube. The topological logic of the cut is not a flat chamfer but a concave spherical triangle, and since the sphere's radius is less than the edge length, the cut surface appears as a curved depression surrounded by three arcs. The overall shape is a cube with a concave corner.","Stretch a cube with an edge length of 50mm. Select one of the vertices and use it as the center to construct a sphere with a radius of 30mm. In the feature options, select ""Cut"" or ""Boolean Subtract"" to remove the volume of the sphere from the cube. The result should show that the corner is removed, forming a concave spherical surface."
L2_49,"Two objects are interlocked but not in contact. The overall appearance is a chain structure. The main base feature, Ring A, is a circular ring with an outer diameter of 40 and an inner diameter of 30, placed horizontally. The extended feature, Ring B, has the same dimensions but is placed vertically. Topologically, Ring B passes through the central hole of Ring A, and the two rings do not overlap in any way, but they cannot be separated. This is a typical topologically interlocked structure, considered as one component despite being multiple entities. The whole structure is a two-ring interlock.","Create two independent entities. Entity 1: Draw a circle in the front view plane and revolve it around the Y-axis to generate a horizontal ring. Entity 2: Draw the same sectional sketch in the right view plane, adjust the center of the circle so that revolving it around the X-axis generates a vertical ring, ensuring that the ring passes through the inner hole of Entity 1 without interference. This is a multi-entity part modeling."
L2_50,"This is a multi-diameter shaft with a keyway. The overall appearance consists of three cylindrical sections of different thicknesses. The main base features are as follows: the left section has a diameter of 40mm and a length of 30mm, the middle section has a diameter of 30mm and a length of 40mm, and the right section has a diameter of 20mm and a length of 30mm, all coaxially connected. An extended feature is a flat-bottomed keyway on the top of the middle cylindrical section, which is 20mm long, 6mm wide, and 3.5mm deep. Detailed features include a center hole at each end face of the shaft, each with a diameter of 5mm and a depth of 10mm. Overall, it is a standard industrial transmission stepped shaft.","Use the revolve command to generate the main body of the stepped shaft. Create a tangent reference plane on the middle cylindrical surface, and draw a straight groove sketch with a length of 20mm and a width of 6mm. Extrude and cut 3.5mm inward. At the center of the left and right end faces of the shaft, draw circles with a diameter of 5mm, and cut to a depth of 10mm."
L2_51,"This is a T-shaped block with extremely rounded edges. The overall appearance resembles three cylinders fused together, but the connections are smooth. The main body consists of two 20x20x60mm rectangular prisms intersecting in a T-shape. All the edges of the T-shaped intersection are rounded with an 8mm radius, making the entire piece appear as if it were smoothly transitioned from cylinders and spheres, with no straight edges remaining. A 5mm diameter hole is drilled at the center of each of the three end faces. The whole piece is a streamlined T-joint.","Draw a T-shaped sketch and extrude it by 20mm to form a T-shaped block. Use the fillet command, select all edges, and set the radius to 8mm. Since the cross-section is only 20mm, a large fillet will make the block's cross-section nearly circular or elliptical. Finally, draw a 5mm diameter circle at the center of the flat ends on three sides and cut through holes."
L2_52,"This is a square tube structure with a tilted top and hollow interior. The overall appearance is a rectangular shell with a slanted top. The main base feature is a 60x60x100mm rectangular column. The extended feature is cut at the top by a plane at a 45-degree angle to the horizontal, leaving the front wall height at 60mm and the rear wall height at 100mm. The detailed feature is that the interior is hollowed out, with a uniform wall thickness of 5mm, forming an irregular tube that runs through from top to bottom. A 20mm diameter circular hole is drilled in the higher rear wall. The overall structure is a sloped exhaust hood casing.","Stretch a 60x60mm rectangle to a height of 100mm. In the front view plane, draw a line from the front edge at Z=60mm to the back edge at Z=100mm, forming a triangular cutting tool, and extrude to cut out the top. Use the shell command to remove the bottom surface with a wall thickness of 5mm. On the higher rear face, draw a circle with a diameter of 20mm and cut out a through hole."
L2_53,"This is a structure where a frame encases a sphere. The overall appearance is a hollow cubic frame with a ""floating"" sphere in the center. The main base feature is a solid cube with an edge length of 60mm. Extended features involve cutting circular through-holes with a diameter of 40mm at the center of each of the six faces of the cube. The six holes intersect at the center, and the remaining material after cutting forms the frame. The detailed feature is a sphere with a diameter of 30mm placed in the central cavity. If simplified to a single entity, it can be described as: after cutting holes on all six sides, the material left in the center forms a specific geometric structure, or it can be directly described as a frame with a solid sphere of 20mm in diameter at the center, connected to the frame by six thin rods. The overall structure is a complex hollow containment.","Stretch a cube with an edge length of 60mm. Draw a circle with a diameter of 40mm on each of the six faces, and completely cut through inwardly. This will form a frame. Create a new solid at the center and rotate it to generate a sphere with a diameter of 30mm. If physical connection is needed, add small connecting columns between the sphere and the inner corners of the frame, or the model can exist as a multi-body component."
L2_54,"Complex openings on the pyramid. The overall appearance is a pyramid with only the edges remaining. The main base feature is a square pyramid with a base edge of 40mm and a height of 40mm. An extended feature involves excavating a smaller square pyramid cavity from the center of the base upwards. Detail features include triangular through-holes on each of the four sides, connecting to the internal cavity. Topological logic transforms the square pyramid into a skeleton composed of four side edges and a base frame. The whole structure is a frame-like pyramid.","Draw a 40x40mm square in the XY plane, extrude it to the vertex at Z=40mm, and generate a solid quadrangular pyramid. Draw a 30x30mm square on the base, cut and loft to the vertex at Z=30mm, hollowing out the interior. On each of the four triangular sides, draw smaller triangular contours, perform cut operations to penetrate the side walls, leaving only the edge framework."
L2_55,"The path and cross-section change simultaneously. The overall appearance is a 90-degree elbow, with one end larger and the other smaller. The main base feature scan path is a quarter-circle arc with a radius of 50mm. The extended feature starts with a circular cross-section of 30mm in diameter and ends with a circular cross-section of 15mm in diameter. The topology logic involves tapering while bending, and the pipe wall surface is a complex doubly curved surface rather than a simple part of a torus. The overall shape is a conical bend.","Use the loft command. First, draw the path in the front view plane: a 90-degree arc with a radius of 50 mm. Create two reference planes: one at the start point of the path and one at the end point. Draw a circle with a diameter of 30 mm on the start plane and a circle with a diameter of 15 mm on the end plane. Execute the loft, select the centerline parameter, and pick the arc path to generate the variable-diameter elbow solid."
L2_56,"The intersection of two hollow tubes, with an overall appearance of a cross-shaped pipe fitting. The base feature consists of two cylinders with a diameter of 40mm and a length of 100mm, orthogonally fused. The extended feature involves shelling the entire merged solid, with a wall thickness of 2mm, and removing all four end faces. The topological challenge lies internally: the tube walls at the intersection of the two cylinders are removed, forming a fully connected cross-shaped internal cavity, rather than two separate tubes inserted into each other. It is necessary to understand the post-processing effect of the shelling operation on the Boolean union. The overall structure is a cross-shaped pipe with uniform wall thickness.","Draw a cross sketch on the front plane: extrude a cylinder with a diameter of 40mm and a length of 100mm along the X-axis; extrude another cylinder with a diameter of 40mm and a length of 100mm along the Y-axis, and perform a Boolean union at the intersection of the two cylinders. Use the shell command, set the wall thickness to 2mm, select and remove the four end faces of the cylinders. The system will automatically calculate and remove the material in the internal intersecting area, forming a fully connected hollow cross tube."
L2_57,"This is a thick disc with semicircular grooves on the edges. The overall appearance resembles a simplified plum blossom. The main body feature is a cylinder with a diameter of 100mm and a thickness of 30mm. The extended features are eight semicircular grooves with a radius of 10mm, evenly distributed on the outer circumference of the cylinder. The axes of the grooves are parallel to the main axis of the cylinder and run through the entire thickness. The detailed feature is a central hole with a diameter of 30mm, and a keyway with a width of 8mm and a depth of 4mm is cut into the side wall of the hole. The whole structure is a typical half of an elastic coupling.","Stretch a cylinder with a diameter of 100 mm and a height of 30 mm. Draw a circle with a radius of 10 mm on the top edge, with its center located on the edge of the cylinder, and cut through. Use a circular array to replicate the cut 8 times. Draw a circle with a diameter of 30 mm at the center of the cylinder and a connected keyway rectangle of 8x4 mm, and cut through."
L2_58,"The appearance is simple, with a hole that turns inside. The overall appearance is a solid rectangular prism. The main body has a basic feature of a rectangular prism measuring 80mm in length, 40mm in width, and 40mm in height. The detailed feature includes an L-shaped circular passage inside: one segment enters horizontally from the center of the left side, 40mm deep; the other segment enters vertically from the center of the top surface, 20mm deep. The topology ensures that the two segments of the hole intersect precisely inside, forming a 90-degree bend flow channel, and the flow channel does not penetrate the opposite surface. Overall, it is a module containing a right-angle bend hole.","Stretch an 80x40x40mm rectangular prism. Select the left side, draw a circle with a diameter, and cut to a depth of 40mm. Select the center of the top surface, draw a circle with the same diameter, and cut to a depth of 20mm. Ensure that the depth parameters of the two holes are such that they intersect precisely and connect internally, forming an L-shaped blind hole channel."
L2_59,"Two holes intersect but do not appear to be through. The overall appearance is a cube. The main feature is a 50mm cube. Detailed features include a 15mm diameter blind hole along the X-axis, 30mm deep, and a 15mm diameter blind hole along the Z-axis, 30mm deep. Topologically, the two holes intersect in the central region, forming an L-shaped internal space. Since both are blind holes, they do not appear to be connected from the outside, but the internal spaces merge. The whole is a dual-blind hole block with internal connectivity.","Stretch a 50mm cube. Select the front face, draw a circle with a diameter of 15mm, and cut to a depth of 30mm. Select the top face, draw a circle with a diameter of 15mm, and cut to a depth of 30mm. The two holes will spatially overlap in the central area of the cube, achieving internal connectivity."
L2_60,"This is a part with holes on both the cylindrical surface and the end face. The overall appearance is a thick-walled ring with multiple holes. The main base feature is a ring with an outer diameter of 90mm, an inner diameter of 40mm, and a thickness of 25mm. Extended feature 1: On the outer cylindrical surface of the ring, there are 6 through-holes with a diameter of 10mm, evenly distributed radially. These holes penetrate the wall and lead to the central hole inside. Extended feature 2: On the upper end face of the ring, there are 6 countersunk holes with a diameter of 8mm, evenly distributed on a circle with a diameter of 65mm. The radial holes and the axial countersunk holes are staggered in their circumferential positions, with the radial holes located at 0, 60, 120... degrees, and the axial holes at 30, 90, 150... degrees. The topological logic ensures that the two sets of holes do not intersect, adding to the complexity of machining and the geometric aesthetics of the part. Overall, it is a complex flange model.","First, draw two concentric circles with an outer diameter of 90mm and an inner diameter of 40mm in the top view plane. Extrude 25mm to create the base ring. Next, create radial holes: select the front view plane, and at Z=12.5mm, draw a circle with a diameter of 10mm, with its center on the outer side. Use the extrude cut command, directing towards the center, and choose ""cut to the next face"" to penetrate the wall. Use the circular array feature to array this cut feature 6 times around the Z-axis. Then, create axial holes: select the top surface of the ring, and draw a construction circle with a diameter of 65mm. On the construction circle, draw a hole location point, rotated 30 degrees relative to the X-axis. Use the non-standard hole wizard or revolve cut to create a countersunk hole. Finally, use the circular array to array this countersunk hole feature 6 times around the Z-axis."
L3_1,"The model is an optical surface for a car headlight reflector, with its geometric essence being a paraboloid of revolution. The vertex of the reflective surface is precisely located at the point (100, 75, 0) in the global coordinate system. This paraboloid has a rotation axis that passes through the vertex and is parallel to the X-axis, with the opening facing the positive direction of the X-axis. Its optical properties are uniquely determined by the focal length, with the focus located 50 millimeters in front of the vertex, at the coordinates (150, 75, 0). This means the focal length f of the paraboloid is 50 millimeters (corresponding to the parabolic equation parameter p=100, i.e., the standard equation $Y^2+Z^2 = 200(X-100)$). The entire reflective surface extends along the positive direction of the X-axis, with a total depth of 100 millimeters, extending from the vertex at X=100 to a plane at X=200, forming a circular opening boundary. This surface is used to reflect the light emitted from a point source placed at the focus into a parallel beam.","First, initialize the modeling environment and ensure the use of a standard Cartesian coordinate system. Select the XY plane (top view) as the sketch reference plane. In the sketch environment, draw a horizontal construction line through Y=75 to serve as the rotation axis for subsequent steps. Next, use the parabola tool to draw a parabolic arc opening to the right. Add geometric constraints to fix the vertex of the parabola at the coordinate point (100, 75, 0). To precisely define the curvature, place a point 50.0 mm to the right of the vertex on the axis of the parabola and constrain it as the focus of the parabola (or annotate the horizontal distance from the vertex to the focus as 50.0 mm). Then, draw a vertical line at x=200 to truncate the parabola, ensuring the axial depth of the reflective surface is 100.0 mm. Trim the excess parabolic segment beyond x>200. After completing the sketch, exit. Invoke the ""revolve surface"" command, select the drawn parabolic arc as the profile, and choose the horizontal construction line at Y=75 as the rotation axis. Rotate 360 degrees to generate the final parabolic reflector solid."
L3_2,"The model is a high-efficiency corrugated fin heat sink unit. The overall base is a rectangular prism, 100mm long, 50mm wide, and 3mm thick, with the top surface of the base located in the Y=0 plane. Continuous sinusoidal fins are distributed along the length (100mm direction) above the base. The cross-sectional profile of the fins (defined as the centerline of the fin thickness) strictly follows the sine function Y = 5 sin(2��X / 20) + 5 (the original vertical offset adjusted to 5mm to ensure the troughs are tangent to the top surface of the base), with an amplitude of 5mm and a wavelength of 20mm. The fins are stretched 50mm along the Z-axis (width direction), perfectly aligned with the width of the base, and the fin wall thickness is 1mm. The sinusoidal structure consists of 5 complete waveform cycles. The overall structure is a flat base with a thin-walled metal sheet standing on it, shaped with sinusoidal bends to increase the heat exchange area.","First, create the part and select the XY plane to draw the base sketch. Draw a 100mm x 50mm rectangle and extrude it by 3.0mm to form the base plate. Select the top surface of the base plate or a parallel reference plane as the sketch plane. Use the ""Equation Driven Curve"" command and input the parametric equations: $x(t) = t$, $y(t) = 5 * \sin(2 * \pi * t / 20)$, with the range of $t$ from 0 to 100. After completing the drawing, use the ""Offset Entities"" command to offset the sine curve unidirectionally by 1.0mm, and close both ends with straight lines to form a closed sine band profile. Use the extrude boss command, select the wavy profile, and extrude it 50.0mm along the Z-axis (i.e., the width direction). Confirm the solid merge. Finally, check the geometric continuity and complete the modeling of the corrugated heat sink."
L3_3,"The model is a standard involute spur cylindrical gear. The gear module is 3, the number of teeth is 20, the pressure angle is 20 degrees, and the tooth width is 15mm. The center of the model contains a shaft hole with a diameter of 20mm, and it has a standard keyway that is 6mm wide and 3mm high (depth measured from the hole wall). The symmetric center plane of the keyway coincides with the symmetric plane of one of the tooth spaces (tooth root). The pitch circle diameter of the gear is 60mm, the addendum circle diameter is 66mm, and the dedendum circle diameter is 52.5mm. The tooth profile is defined by the standard involute equation, and a fillet with a radius of 0.9mm is provided at the tooth root. Overall, it presents as a typical industrial transmission component with precise tooth geometry.","First, set the parameters: module m=3, number of teeth z=20, pressure angle alpha=20. Calculate the pitch circle diameter D=60, and the base circle diameter Db=D*cos(20)=56.38. Choose the XY plane and sketch the gear profile. Use the ""equation curve"" to draw the involute segment, with the equations: X(t) = 28.19 * (cos(t) + t * sin(t)), Y(t) = 28.19 * (sin(t) - t * cos(t)). Construct the single tooth space shape using mirror and circular array logic, ensuring the tooth thickness at the pitch circle is �� * m / 2. Extrude a boss to generate the gear blank (or directly extrude the tooth shape), with a thickness of 15.0mm. If a cylindrical blank is generated first, use the extrude cut command to cut out the tooth spaces and array 20 times. Next, on the end face, draw a center circle with a diameter of 20.0mm and a keyway rectangular profile of 6x3mm, then perform an extrude cut ""all the way through"". Finally, apply a 0.9mm fillet at the root connection to complete the gear construction."
L3_4,"The model is an aerodynamic, streamlined arm casing for a drone. The overall shape of the model is a slender spindle, with the cross-section along the axis smoothly transitioning from a circle to an ellipse and finally back to a circle. The core feature, the spine line, is controlled by a cubic Bezier curve with control points at P0(0,0,0), P1(30, 20, 0), P2(100, 25, 0), and P3(150, 5, 0), forming a smooth, raised upper surface contour. The overall shape of the arm is controlled by four key cross-sectional positions: the starting end (X=0mm) is a circle with a diameter of 15mm; at X=50mm, it transitions to an ellipse with a major axis of 25mm and a minor axis of 20mm; at X=100mm, it narrows to an ellipse with a major axis of 22mm and a minor axis of 18mm; and the end (X=150mm) is a circle with a diameter of 20mm. After lofting, the shell has a uniform wall thickness of 1.5mm. This multi-section guided free-form surface construction ensures a balance between low wind resistance and structural strength.","First, enter the surface modeling module or multi-section lofting mode. Create four datum planes: Plane1 at X=0, Plane2 at X=50, Plane3 at X=100, and Plane4 at X=150. Draw a 15mm diameter circle on Plane1; draw an ellipse (major axis 25mm, minor axis 20mm) on Plane2; draw an ellipse (major axis 22mm, minor axis 18mm) on Plane3; draw a 20mm diameter circle on Plane4. Next, on the Front plane (XZ), draw a guide line using the ""spline"" tool, defining four control points P0(0,0), P1(30,20), P2(100,25), P3(150,5) to generate the upper profile ridge line. Use the ""lofted boss"" command, select the four sections in sequence, and choose the drawn Bezier curve as the ""centerline"" or ""guide line"" to control the shape flow. After generating the solid, use the ""shell"" command, remove the two end faces, set the wall thickness to 1.5mm, and complete the streamlined arm modeling."
L3_5,"This model represents a standard ellipsoidal head for a pressure vessel used in the chemical industry. The component consists of two parts:

The lower section is a cylindrical straight flange with an outer diameter of 200 mm and a height of 50 mm.
The upper section is a hemi-ellipsoidal dome formed according to the standard ellipsoidal equation, where the major axis equals the minor axis at 200 mm (i.e., the nominal diameter), and the total depth of the head (i.e., the semi-minor axis along the height direction) is 100 mm, resulting in a 2:1 ratio of major to minor semi-axes.
The entire head has a uniform wall thickness of 10 mm. At the apex (vertex) of the ellipsoidal surface, a nozzle flange is welded vertically upward, featuring an outer diameter of 40 mm, an inner diameter of 30 mm, and a height of 30 mm.

This part integrates a cylindrical surface with a quadratic surface (ellipsoid) and is commonly employed in high-pressure applications.","First, select the Front plane to draw a rotational sketch. Start from the origin and draw a vertical centerline upwards. Draw the profile lines: first, draw a vertical line segment from (100, 0) to (100, 50) (representing the straight edge). Next, use the ""partial ellipse"" tool, with (0, 50) as the center, a major axis of 100mm (horizontal), and a minor axis of 50mm (vertical), to draw a quarter-ellipse arc connecting (100, 50) to (0, 100). Use the ""offset entities"" command to offset this combined curve inward by 10.0mm, and close the profile to form a closed section. Select the Y-axis and rotate 360 degrees to generate the main body of the head. Then, select the tangent plane at the top vertex of the head, and draw a concentric ring sketch with an outer diameter of 40mm and an inner diameter of 30mm. Extrude it outward by 30.0mm to create the nozzle. Check the model to confirm it is an ellipsoidal head with a straight edge."
L3_6,"The model is a cylindrical camshaft used for reciprocating mechanisms. The main body is a solid cylinder with a diameter of 40mm and a length of 100mm. On the outer surface of the cylinder, there is a closed, continuous sine wave guide groove. The center path of the guide groove encircles the cylinder once, and when unrolled, it corresponds to the equation $Y = 30 \sin(\phi)$ ($\phi$ ranges from 0 to 360 degrees), forming one cycle of a sine wave on the unrolled cylindrical surface, with the peaks and valleys spanning 60mm axially (��30mm). The width of the guide groove is 6mm, the depth is 4mm, and the cross-section is a U-shape with a fully rounded bottom radius of 3mm. The overall appearance is that of a precision shaft part with a serpentine groove around it.","First, select the Front plane and draw a circle with a diameter of 40.0mm. Extrude it by 100.0mm to create the base cylinder, ensuring the extrusion type is ""Symmetric"" for easy positioning. Next, use the ""Wrap"" or ""Unfold"" technique. Select a reference plane tangent to the cylinder and draw an unfolded sketch: draw a construction line with a length equal to the circumference of the cylinder (40 * �� �� 125.66mm), and within this range, draw a sine curve with an amplitude of 30.0mm and a period corresponding to the full length. Use the ""Groove"" tool with the curve as the centerline, setting the groove width to 6.0mm. Exit the sketch and use the ""Wrap"" command, selecting the ""Etch/Indent"" option, with the target face being the cylindrical surface and the depth set to 4.0mm. Alternatively, use the ""Sweep Cut"" command, first generating a 3D helical sine path using an equation curve, then sweeping a rectangular profile. Complete the cam groove construction."
L3_7,"The model is a scroll compressor's orbiting scroll. The key feature is the scroll wall formed based on the involute of a circle. The base circle radius is 3 mm, and the involute generation angle ranges from 0 to 1080 degrees (3 turns). The scroll wall has a uniform thickness of 4 mm and a height of 25 mm. The scroll plate is a circular disk with a diameter of 80 mm and a thickness of 5 mm. The scroll wall stands vertically on the plate. The starting end of the involute wall is smoothly closed by a semicircle with a radius of 2 mm, tangent to both sides of the wall. The overall structure is precise and used for gas compression, with an appearance resembling a spiral labyrinth.","First, select the Top plane to draw the base sketch, and draw a circle with a diameter of 80.0 mm, then extrude it by 5.0 mm. Select the top surface of the base for drawing. Use ""Equation Driven Curve"" and input the parametric equations to define the involute outer wall: $X(t) = (3 + 4) * (\cos(t) + t * \sin(t))$, $Y(t) = (3 + 4) * (\sin(t) - t * \cos(t))$ (Note: This is a simplified logic; in practice, two curves for the inner and outer walls need to be drawn). A more general approach is to draw an involute with a base circle radius $R=3$ and set the range from 0 to $6\pi$. Use the ""Offset Entities"" command to offset inward or outward by 4.0 mm to obtain the wall thickness. Close the ends of the spiral (use a tangent arc at the center and cut off with an arc at the outer end). Select the closed spiral ring area and extrude it along the Z-axis by 25.0 mm. Ensure that the wall and the base are merged into one solid. Complete the modeling of the scroll disc."
L3_8,"The model is an inner core model of a Laval nozzle. Its internal flow channel is formed by two specific curves: the converging section is a free surface composed of a cubic Bezier curve, which is tangent to the central axis at both the inlet and throat ends, with the length of the tangent control arms at both ends being 15 mm; the diverging section is a paraboloid of revolution with its vertex at the center of the throat and opening towards the exit. The inlet diameter is 50 mm, the throat (narrowest part) diameter is 20 mm, and the exit diameter is 60 mm. The length of the converging section is 30 mm, and the length of the diverging section is 50 mm. The outer wall of the model follows the shape of the inner wall, maintaining a wall thickness of 3 mm. This is a typical supersonic fluid control component.","Initialize the environment and select the Front plane as the sketch plane. Draw a construction centerline along the X-axis. Define the throat position at X=0, Y=10 (radius). The inlet position is at X=-30, Y=25. The outlet position is at X=50, Y=30. For the first section (converging section): use a spline curve (Bezier) to connect the inlet point (-30, 25) and the throat point (0, 10), adjust the tangent handles so that the tangent at the throat is horizontal and the tangent at the inlet is slightly inward. For the second section (diverging section): draw a parabolic segment with the vertex at the throat (0, 10), opening to the right, passing through the outlet point (50, 30). After completing the inner wall profile, offset the entity outward by 3.0mm. Close the ends of the ports. Select the closed profile, choose the centerline as the axis, and perform a 360-degree revolved boss. Complete the Laval nozzle modeling."
L3_9,"The model is a bionic design of a wavy vase/decorative column. The base is a circle with a diameter of 60mm, and the top is a circle with a diameter of 80mm, with a height of 150mm. The transition between the bottom and top is not linear but varies in cross-section with height, changing from a circular shape to a sinusoidal ring with six peaks, and then back to a circular shape. Specifically, at a height of 75mm, the cross-section is a sinusoidal ring with an average diameter of 70mm and a wave amplitude of 5mm (resembling a six-petaled flower shape), with the centerline of one of the peaks strictly aligned with the positive X-axis. The overall surface is generated through lofting, resulting in a smooth and continuous surface that presents an organic flow.","First, create three datum planes: Plane1 (Z=0), Plane2 (Z=75), and Plane3 (Z=150). Draw a 60.0mm diameter circle on Plane1. Draw an 80.0mm diameter circle on Plane3. On Plane2, draw the middle section: first, sketch a 70.0mm diameter construction circle (radius 35mm) and use it as the reference for a sine wave. Draw a closed wavy line with 6 periods, where the peak vertices are 40mm from the center and the troughs are 30mm from the center (amplitude 5mm). Exit the sketch. Use the ""Lofted Boss/Base"" command. Select the bottom circle, the middle wavy ring, and the top circle as profiles in sequence. In the start/end constraints, choose ""Perpendicular to Profile"" for a smoother transition. Confirm to generate the solid. If you need to make it into a container, use the ""Shell"" command, remove the top face, and set the wall thickness to 2.0mm. Complete the model."
L3_10,"This is a parabolic reflector concentrator for optoelectronic devices. The main body is a solid of revolution, with its inner surface being a standard paraboloid of revolution, designed to reflect light from the focal point in parallel. Considering the equation constraints, the maximum outer diameter of the model is adjusted to 170mm, and the total height is 80mm. The key feature is that the parabolic equation of the inner surface follows Z = R^2 / 80 (i.e., the focal length is 20mm), with the paraboloid opening upwards and the bottom vertex located at (0,0,0). The shell has a uniform wall thickness of 5mm. At the top outer edge of the concentrator, there is a flange with a width of 10mm and a thickness of 5mm, uniformly distributed with four mounting holes of 5mm in diameter, one of which is located in the positive Y-axis direction. At the center of the bottom, there is a cylindrical through-hole with a diameter of 10mm for installing the light source. The overall structure presents a smooth, streamlined bowl shape.","This model is a parabolic reflector focusing cup with a total height strictly controlled at 80mm. The inner surface is defined by the optical equation Z = R^2/80. Based on a height of 80mm, the top inner radius is derived to be 80mm. Solid generation: First, draw the parabolic contour of the inner surface (X from 0 to 80mm), then rotate it around the central axis to generate the inner surface. Next, uniformly thicken the surface outward by 5.0mm to form the main shell (at this point, the outer diameter of the main body is 170mm). Flange feature: Add an annular flange to the outer edge at the top of the cup, with a flange width of 10mm (the outer radius extends to 95mm), a thickness of 5mm, and the bottom surface flush with the cup opening. Hole features: Uniformly distribute 4 mounting through-holes with a diameter of 5mm at the center position of the flange (at a radius of 90mm), with one located in the positive Y direction. A light source hole with a diameter of 10mm is cut out at the center of the bottom."
L3_11,"The model is an aerodynamic intake manifold with a complex free-form surface, presenting a smooth S-shaped pipe structure with a specific inclination. In its overall appearance, it starts from a wide elliptical cross-section at the bottom, gradually narrows and twists along a spatially curved path, and terminates at a circular flange interface at the top. 

In terms of the main base features, the bottom surface lies in the XY plane and is an ellipse with the major axis along the X-axis and the minor axis along the Y-axis. The major axis is 120 millimeters long, and the minor axis is 80 millimeters long, with the center located at the origin. The top surface is a perfect circle with a diameter of 60 millimeters. This circle's plane is not horizontal but is tilted 45 degrees relative to the XY plane, and its center is offset by (60, 0, 120) millimeters relative to the bottom center.

The extended feature is the pipe body connecting the bottom and top surfaces. The central guide line is not a straight line or an arc but a cubic B��zier curve. The curve starts at (0,0,0) and ends at (60,0,120). To form a natural S-shaped flow, the first control point P1 is at (0, 0, 60) (vertically upward), and the second control point P2 is at (60, 0, 60) (horizontal transition), ensuring the pipe rises vertically at the start and tilts at a 45-degree angle to enter the top plane at the end.

Detailed features include that the model is a hollow thin-walled structure with a wall thickness of 3 millimeters. At the top inclined circular port, there is an outward-extending flange lip with a width of 5 millimeters and a thickness of 2 millimeters. The overall structure emphasizes that this is a typical non-orthogonal fluid fitting, entirely generated by lofting between the bottom ellipse, the top inclined circle, and the intermediate cubic B��zier guide curve, with no right-angle turns.","First, initialize the modeling environment and set the units to millimeters (mm). 1. Construct the bottom profile: Select the top view datum plane (XY plane) and draw Sketch 1. Draw an ellipse centered at the origin (0,0,0), with the major axis constrained along the X-axis and a length of 120.0; the minor axis along the Y-axis with a length of 80.0. Exit the sketch. 2. Construct the guide curve: Select the front view datum plane (XZ plane) and draw Sketch 2. Use the ""Style Spline"" tool or directly select the Bezier curve mode to draw a cubic Bezier curve. Set the start point coordinates to (0,0,0) and the end point coordinates to (60,0,120). Set the first control point (Control Vertex) coordinates to (0,0,60) and the second control point coordinates to (60,0,60). Ensure that the curve endpoints and control points are fully constrained. Exit the sketch. 3. Construct the top datum plane and profile: Create a new datum plane that passes through the endpoint of the curve (60,0,120) and is perpendicular to the tangent direction of the curve at that point (the tangent should be at a 45-degree angle to the horizontal plane). On this new datum plane, draw Sketch 3, and draw a circle with a diameter of 60.0 centered at the endpoint of the curve. Exit the sketch. 4. Generate the main surface: Enable the ""Loft Boss/Base"" command. In the profile selection box, sequentially select the elliptical sketch at the bottom (Sketch 1) and the circular sketch at the top (Sketch 3). In the centerline/guide curve parameter, select the Bezier curve drawn in step 2 (Sketch 2). Confirm the preview and generate the solid. 5. Shell processing: Use the ""Shell"" command, select the bottom and top faces as the removal faces, set the wall thickness parameter to 3.0 mm, and direct it inward. 6. Add the top flange: Select the inclined annular end face at the top of the model as the sketch plane, use ""Convert Entities"" to obtain the inner hole edge, and draw a concentric circle with a diameter of 70.0 (forming a 5 mm wide ring). Use the ""Extruded Boss"" command to extrude 2.0 mm outward along the normal direction. Complete the model construction."
L3_12,"The model is a precision industrial optical or acoustic concentrator base with a distinctly asymmetric inclined structure. The overall appearance consists of a robust cylindrical base and a paraboloid that is recessed on its beveled surface, with the outer wall of the base featuring a continuous wavy sine wave groove. The main body starts with a standard cylinder with a diameter of 80 millimeters and a height of 60 millimeters. The top of this cylinder is not flat but is cut by a plane, the normal of which lies in the YZ plane, resulting in an elliptical cross-section tilted at 30 degrees relative to the horizontal plane, with the highest point of the cross-section located in the negative Y-axis direction.

The extended features are concentrated on this inclined elliptical surface. On this surface, there is a recessed paraboloid of revolution. The axis of symmetry of the paraboloid is perpendicular to the inclined surface, with its vertex at the geometric center of the inclined surface. The geometric parameters of the paraboloid are set with a focal length f = 10 millimeters (satisfying the local coordinate equation x^2 + y^2 = 40z), and the opening diameter on the inclined surface is limited to 60 millimeters, forming a smooth energy-focusing bowl-like structure.

The detailed feature is on the outer side of the cylindrical base, where at a height Z = 30 millimeters, a closed sine wave groove is carved. This sine wave wraps around the cylinder once, with six complete cycles (peaks) and an amplitude (up and down oscillation) of 5 millimeters. The cross-section of the groove is semicircular with a radius of 2 millimeters.

The overall structure emphasizes: the model integrates external cylindrical geometry, a beveled top cut, an internally mathematically defined paraboloid, and periodic sine wave patterns on the side walls, forming a complex single-part component that combines multiple analytical geometric features.","Initialize the modeling environment and select the top reference plane (XY plane) as the drawing reference. 1. Construct the base cylinder and bevel: Draw a circle with a diameter of 80.0 on the XY plane, and extrude it 60.0 mm along the positive Z-axis to form a cylindrical solid. Select the front reference plane (YZ plane, assuming the Y-axis is to the right and the Z-axis is upward), and draw a line through the cylinder that passes through the point (0,0,60) and forms a 30-degree angle with the X-axis (left high, right low, simulating cutting). Use the ""extrude cut"" command to remove the part of the solid above the line/plane, forming an inclined top surface. 2. Construct the inclined auxiliary plane: Select the newly generated inclined elliptical surface and create a new reference plane (Reference Plane 1). Alternatively, directly select this surface for sketching. 3. Construct the parabolic cavity: To accurately build the parabolic surface, we need to draw the profile on a section perpendicular to the inclined surface. Create an auxiliary plane perpendicular to ""Reference Plane 1"" and passing through the center of the circle (similar to the local coordinate YZ plane). Enter the sketch on this plane and draw half of the parabola. Set the vertex of the parabola at the center of the inclined surface, with the axis pointing vertically into the solid. The equation constraint is $X^2 = 40Y$ (here, Y represents the local depth axis, and X is the radial direction), or by plotting points: vertex (0,0), passing through the point (30, 22.5) (from which $30^2 = 4p \times 22.5 \rightarrow 900=90p \rightarrow 4p=40$). Close the sketch to form a revolved section, and use the ""revolve cut"" command to rotate 360 degrees around the parabola's axis, creating the parabolic cavity. 4. Construct the sine wave groove: Select the front reference plane (parallel to the cylinder axis). Use the ""equation-driven curve"" function to draw a sine wave. Use the parametric equations: $x_t = 40 \times \sin(t)$, $y_t = 30 + 5 \times \sin(6 \times t)$, $z_t = 40 \times \cos(t)$ (note: different CAD software may have different ways to input equations, here the logic is the cylindrical coordinate expansion). Alternatively, a more general method: on the unrolled cylindrical plane (length $80\pi$, width 60), draw the equation $Y = 5 \times \sin(6 \times (X / (80\pi) \times 360)) + 30$, then use the ""wrap"" command, select the ""deboss"" option, and project it onto the outer surface of the cylinder, setting the depth to 2.0 mm. If the software does not support equation wrapping, first create a helix or 3D sine curve, then perform a sweep cut along the path."
L3_13,"The model is a standard involute spur cylindrical gear, classified as a precision transmission component. It is based on a cylindrical appearance, with the core feature being its tooth profile. The gear module is 3, the number of teeth is 20, the pressure angle is 20 degrees, and the tooth width is 30mm. The base circle diameter is calculated precisely based on the module and pressure angle (60 �� cos(20��)). The gear center includes a 20mm diameter shaft hole, with a standard keyway that is 6mm wide and 3mm deep. The tip circle diameter is 66mm, and the root circle diameter is 52.5mm. Each end face of the gear has a circular weight-reducing groove, with an outer diameter of 45mm and an inner diameter of 32mm (leaving a 32mm diameter hub), making the hub slightly protrude. The overall structure is compact, and the tooth profile is precise.","Create a part file and set the units to millimeters. Draw a sketch on the XY plane. Define global variables: module m=3, number of teeth z=20, and pressure angle ��=20��. Calculate the pitch circle diameter d=m��z=60, and the base circle diameter db=d��cos(��). Use parametric equations to draw the involute profile of a single tooth, with the equations X(t) = 0.5 �� db �� (cos(t) + t �� sin(t)), Y(t) = 0.5 �� db �� (sin(t) - t �� cos(t)). Mirror the profile to create the other side of the tooth space, and connect the top arc (diameter 66) and the root arc (diameter 52.5). Extrude the sketch area 30.0mm to form the gear blank. Use the circular array feature to array the single tooth feature 20 times. Draw a circle with a diameter of 45.0mm on the end face, extrude cut 3.0mm to form a groove, and mirror this feature on the other side. Finally, draw a circle with a diameter of 20.0mm and a keyway contour of 6x3mm at the center, and perform an extrude cut through the entire solid."
L3_14,"This is a high-efficiency corrugated fin heat sink. The overall profile is a rectangular prism, 100mm in length, 50mm in width, and with a base thickness of 5mm. The most prominent feature is that its heat dissipation fins are not flat plates but curved thin walls along the length direction, forming a sine wave shape. The sine wave equation is defined as $Y = 2 \times \sin(0.2 \times \pi \times X)$ (amplitude 2mm, period 10mm), with a fin height of 30mm and a thickness of 1mm (symmetrically offset on both sides with the sine curve as the center plane). On the 50mm wide base, five rows of such corrugated fins are arranged in parallel, with a spacing of 10mm. The bottom of the base is flat for attaching to the heat source. The overall structure not only increases the heat dissipation area but also disturbs the fluid boundary layer.","Select the XY plane to sketch the base, draw a 100x50mm rectangle, and extrude 5.0mm in the positive Z direction. Select the top surface of the base as the reference plane, and draw the first fin path: use the ""Equation Driven Curve"" tool, input the equation Y = 2 * sin(0.2 * �� * X), with X ranging from 0 to 100. Position this spline 5.0mm away from the edge of the base along the Y-axis. Exit the sketch, use the ""Thin Wall Extrude"" or ""Sweep"" command, with the sine curve as the path, extrude 30.0mm along the Z-axis, and set the wall thickness to 1.0mm (symmetric or one-sided). After completing the first fin, use the linear pattern command, select the fin feature, and array 5 instances along the Y-axis with a spacing of 10.0mm. Confirm there is no interference and complete the model."
L3_15,"The model is a high-pressure elliptical head tank cover, commonly used in chemical containers. The main body consists of a hemi-ellipsoid and a cylindrical straight section. The key geometric feature is that the inner surface profile of the head is a standard semi-ellipse, with the major axis (diameter direction of the tank) measuring 200mm and the minor axis (depth direction of the head) measuring 100mm (major to minor axis ratio of 2:1). At the bottom of the semi-ellipse, there is a straight cylindrical section with a height of 25mm. The overall wall thickness is uniformly 8mm (offset outward). At the vertex of the ellipsoid, a flange�ӹܷ��������ڰ�װѹ���������������Ҿ��ȡ�

At the vertex of the ellipsoid, a flange with an outer diameter of 40mm, an inner diameter of 30mm, and a height of 30mm is vertically welded for installing a pressure gauge. The material is continuous and uniform.","Select the XZ plane (Front view) as the sketch plane. Draw a vertical centerline construction line. Using the Ellipse tool, create a quarter-elliptical arc centered at the origin with a horizontal semi-major axis of 100.0 mm (corresponding to a diameter of 200 mm) and a vertical semi-minor axis of 50.0 mm (corresponding to a total depth of 100 mm). From the bottom endpoint of the elliptical arc (100, 0), draw a vertical line segment downward with a length of 25.0 mm. Apply the ""Offset Entities"" command to offset the entire profile inward by 8.0 mm to establish the wall thickness, then close both the top and bottom openings with straight lines to form a fully enclosed section profile. Select the Y-axis (the central vertical construction line) as the axis of revolution, and revolve the profile 360 degrees to generate the main body of the dished head. Create a tangent plane at the apex of the head, then sketch two concentric circles with diameters of 40 mm and 30 mm on this plane. Extrude a boss feature upward by 30.0 mm to form the top nozzle."
L3_16,"This is an ergonomic streamlined mouse top cover. The overall appearance of the model is smooth, with no sharp edges, and it features an asymmetrical raised shape. The core contour is controlled by two main cubic Bezier curves: the longitudinal spine (side view) and the transverse grip line (top view). The longitudinal spine starts at (0,0,0), with control point 1 at (20, 0, 35), control point 2 at (80, 0, 35), and ends at (110, 0, 0). The transverse cross-section varies with length, with the widest part located at the rear one-third, measuring approximately 60mm in width. The surface is generated through lofting and curls inward at the edges to fit the base. On the left side, there is a concave thumb rest area, trimmed from a freeform surface.","Establish a 3D sketch environment. First, draw the longitudinal spine in the XZ plane: use a B-Spline, define the start point (0,0,0) and end point (110,0,0), and set two control points at (20,0,35) and (80,0,35) to control the height of the bulge. In the XY plane, draw the bottom contour curve using a B-Spline to outline the asymmetric edge of the mouse base. Create multiple reference planes parallel to the YZ plane (for example, at X=0, X=40, X=80, X=110), and on these planes, draw cross-sectional profiles (arched), constraining the top vertices to pass through the longitudinal spine and the bottom vertices to pass through the bottom contour. Use the ""loft surface"" command, select the cross-sections in sequence, and choose the longitudinal spine and bottom contour as guide curves to generate a free-form surface controlled by cubic Bezier curves. Finally, use the ""thicken"" command to thicken inward by 2.0mm to create a solid."
L3_17,"The model is a cylindrical sine camshaft used in reciprocating motion mechanisms. The main body is a solid cylinder with an outer diameter of 50mm and a length of 100mm. On the outer cylindrical surface, there is a continuous closed sine wave guide groove. The centerline trajectory of the groove, when unrolled, forms a standard sine curve $Y = 15 \times \sin(\theta) + 50$, where Y is the axial coordinate, and $\theta$ is the circumferential angle (0 to 360 degrees corresponding to 0 to $2\pi$). The reference position is 50mm from one end. The groove width is 8mm, and the depth is 5mm, with a U-shaped cross-section. The bottom of the groove cross-section is a complete semicircle with a radius of 4mm, and the groove width direction is always perpendicular to the tangent direction of the trajectory line. This structure ensures that the follower performs a reciprocating harmonic motion along the axial direction as it rotates one full turn.","Initialize the environment and draw a circle with a diameter of 50.0 mm in the XY plane. Extrude it along the Z-axis by 100.0 mm to form the base cylinder. Select the sketch plane required for the ""Wrap"" or ""Unwrap"" feature, such as the XZ plane. Draw a rectangle representing the unwrapped surface of the cylinder (width = 100, length = $\pi \times 50$). Within this rectangle, sketch a sine curve: $Y = 15 \times \sin(k \times X) + 50$, where X corresponds to the unrolled circumference length. Use the ""Offset Entities"" tool to create a bidirectional offset of 4.0 mm, forming an 8 mm wide groove profile, and close the ends. Exit the sketch and use the ""Wrap"" command, selecting the ""Etch/Engrave"" option, with the target face being the side of the cylinder, and set the depth to 5.0 mm. The system will automatically project and wrap the sine curve sketch onto the cylindrical surface for cutting, completing the cam groove construction."
L3_18,"This is a decorative ellipsoidal grid lampshade. The base profile of the model is a rotational ellipsoid with a major axis of 120mm (vertical direction) and a minor axis of 80mm (horizontal direction). The ellipsoid is hollow with a wall thickness of 3mm. The geometric complexity lies in the fact that the surface of the ellipsoid is not fully enclosed but is formed by 12 longitudinal ribs (along the major axis) and 3 latitudinal rings (perpendicular to the major axis), creating a latticed structure. The longitudinal ribs are distributed along the elliptical contour with a width of 4mm; the central planes of the latitudinal rings are located at Z-axis heights of -30mm, 0mm, and +30mm (with the center of the ellipsoid as the origin), corresponding to 1/4, 1/2, and 3/4 of the ellipsoid's height, and also have a width of 4mm. There is a 10mm diameter hole at the top for wiring, and the bottom part below Z-axis -50mm is cut off to form an opening. The overall structure is latticed.","First, draw the basic rotational sketch: on the front view datum plane, draw a semi-ellipse centered at the origin with the major axis along the Y-axis (semi-major axis 60) and the minor axis along the X-axis (semi-minor axis 40). Use the ""revolved surface"" feature to generate the reference ellipsoid. Next, construct the solid ribs: on the same datum plane, draw a closed rectangular section that overlaps with the ellipse contour (width 4mm, thickness 3mm, curved to follow the ellipse curvature), and revolve along the ellipse path to generate the solid or use the sweep feature. A better approach is: draw the cross-sectional sketch of a single meridional rib, and use the sweep feature along the ellipse path to generate one rib. Use the ""circular pattern"" to array this rib around the Y-axis 12 times. Then, create three horizontal datum planes (Y=30, 0, -30), and on each plane, draw an annular sketch (outer diameter fitting the ellipsoid surface, inner diameter = outer diameter - 3mm), and extrude 4.0mm to form the latitudinal rings. Finally, cut out the top through-hole and combine all the solids."
L3_19,"The model is the fixed scroll of a scroll compressor, with extremely precise geometric construction. The main body is a circular base with a diameter of 120mm and a thickness of 10mm. On the base, there is a wall in the form of an Archimedean spiral (or involute combination) that rises vertically. The wall height is 25mm, and the wall thickness is 4mm. The polar equation of the spiral is given by $r = 20 + 3.5\theta$ (in mm, $\theta$ in radians), starting at an angle of 0 and ending at $3\pi$. At the center of the disc, there is an exhaust hole with a diameter of 8mm, forming approximately 1.5 turns of the scroll wall. The end of the scroll wall is rounded with an R2 fillet for a smooth transition.","Sketch the base in the XY plane with a diameter of 120.0 mm and extrude it by 10.0 mm. Select the top surface of the base to draw, and use ""Equation Driven Curve"" to plot the helical centerline: parametric equations $X(t) = (5 + 3t) \times \cos(t)$, $Y(t) = (5 + 3t) \times \sin(t)$, with t ranging from 0 to $3\pi$ (this is an approximation of an Archimedean spiral; use the corresponding equation for an involute if needed). After drawing, use ""Offset Entities"" to offset bidirectionally by 2.0 mm to create a 4.0 mm wide helical groove, and close the start and end points with arcs. Select the closed helical area and extrude it 25.0 mm along the Z-axis. At the center of the base, draw a circle with a diameter of 8.0 mm centered at the origin, and perform an extruded cut through the base as an exhaust port. Apply a R0.5 chamfer to the top edge of the vortex wall to remove burrs."
L3_20,"This is a single twisted blade fan. The model consists of a central hub and one twisted blade. The hub is a cylinder with a diameter of 30mm and a height of 20mm. The blade extends from the side of the hub, with a length of 60mm. The cross-section of the blade is a streamlined airfoil (an asymmetric teardrop shape based on a cubic Bezier curve). The most critical feature is that the blade twists as it extends radially: the installation angle at the root section is 45 degrees, while at the tip section, it is 15 degrees, resulting in a linear twist of 30 degrees. Additionally, the chord length (width) of the blade tapers from 25mm at the root to 15mm at the tip. This complex free-form surface provides optimized aerodynamic performance.","First, create the hub: draw a 30mm diameter circle and extrude it by 20mm. Establish auxiliary planes for blade generation: create a ""root plane"" 15mm from the center (tangent to the hub) and a ""tip plane"" 75mm from the center. On the root plane, sketch an airfoil: use a spline to draw a closed contour similar to a NACA airfoil with a chord length of 25mm, and rotate the entire sketch by 45 degrees (angle of attack). On the tip plane, draw a similar airfoil sketch with a chord length of 15mm, and rotate the sketch by 15 degrees. Ensure that the leading edges of both sketches are aligned. Use the ""loft boss"" command and select the root and tip profiles in sequence. In the guide curve options, add 3D splines connecting the leading and trailing edges of the two sections if precise control is needed. Confirm the operation to generate the twisted blade solid. Finally, apply a 2.0mm radius fillet at the connection between the blade and the hub."
L3_21,"This is a Laval Nozzle model, commonly found in rocket engines. The model is an axisymmetric body of revolution. The internal flow channel structure is complex: the inlet section has a smooth transition with a 50mm radius arc, the throat is the narrowest part (10mm in diameter), and the exit section (expansion section) is a paraboloid designed to accelerate the airflow to supersonic speeds. The vertex of the parabolic equation for the expansion section is located at the throat, passing through the endpoint with a 40mm diameter, opening towards the exit. The outer wall contour of the nozzle is an elliptical arc segment designed for structural strength, with a maximum outer diameter of 60mm. The total length of the nozzle is 100mm, with the convergent section being 20mm long and the divergent section 80mm long. Both the inlet and outlet have flanges with a diameter of 60mm and a thickness of 5mm.","Create an XZ datum plane sketch. Draw the central axis. Construct the internal flow path profile: draw an arc from the inlet (X=-20, Y=15) to the throat (X=0, Y=5); draw a parabolic segment from the throat (X=0, Y=5) to the outlet (X=80), with the equation satisfying the vertex at (0,5) and passing through the outlet point (e.g., X=80, Y=25). Construct the external profile: starting from the outer edge of the inlet (X=-20, Y=20), draw an elliptical arc to the outer edge of the outlet (X=80, Y=30), ensuring the wall thickness is maximum at the throat to withstand high pressure. Connect the inner and outer points of the inlet and outlet to form a closed region. Use the ""revolved boss"" command, select the central axis, and rotate 360 degrees. At X=-20 and X=80, draw larger-diameter disks based on the end faces and extrude them to form flanges."
L3_22,"The model is a lightweight drone motor mount frame, featuring a hollow truss structure. The overall shape is a truncated conical cage, with a 60-millimeter diameter mounting ring at the bottom and a 40-millimeter diameter motor mount at the top. The bottom mounting ring has four M4 bolt hole lugs. Connecting the top and bottom are eight inclined cylindrical supports, forming a cage-like support. At the center of the top motor mount plane, there is a 10-millimeter diameter bearing hole, surrounded by four motor fixing holes (3 millimeters in diameter). To enhance rigidity, a horizontal reinforcement ring connects all the supports at their mid-height. All connection points (supports to top and bottom mounts, supports to the middle ring) have been smoothly filleted. This is a typical multi-rod, multi-hole spatial topology solid.","First, initialize the modeling environment and draw the base sketch on the XY reference plane, which includes an annular ring with an outer diameter of 60.0 mm. Construct four lugs with M4 bolt holes at equal intervals around the circumference. Extrude the sketch to form the base solid. Next, set a parallel offset plane at a certain height above the base and draw the top motor mount sketch with a diameter of 40.0 mm. Center a bearing through-hole with a diameter of 10.0 mm and array four motor mounting holes with a diameter of 3.0 mm around the center. Extrude this sketch to form the top motor mount. Then, between the upper and lower mounts, use cylindrical loft or array features to place eight cylindrical pillars that incline toward the center at equal intervals, forming a frustum-shaped cage truss structure. At the midpoint of the pillar height, create a horizontal reference plane and draw and extrude a horizontal reinforcing ring that intersects and merges with all the inclined pillars to enhance the overall torsional stiffness. Finally, apply large-radius fillets to all the intersecting edges between the pillars, the top motor mount, the bottom mounting ring, and the intermediate reinforcing ring to ensure uniform stress distribution and no stress concentration in the connections."
L3_23,"This is a rectangular hydraulic manifold used for fluid distribution, featuring a complex internal network of channels. The model's exterior is a solid steel rectangular block measuring 200x100x80 millimeters. On the main top surface (200x100 face), there are two rows of 10 vertically downward oil outlets, each with a diameter of 10 millimeters. On the front side (200x80 face), there are 3 larger oil inlets, each with a diameter of 20 millimeters, extending horizontally into the interior. The internal structure is extremely complex, with these 3 inlets converging internally and connecting to the 10 top outlets through a horizontal main channel (forming an inverted T or cross-shaped connection). Additionally, at each corner of the rectangular block, there are countersunk bolt holes for mounting. To reduce weight, there are 4 deep oval-shaped weight-reduction grooves on the bottom and side surfaces in non-channel areas. The overall structure consists of a rectangular base, 13 external interface holes, an internal network of channels, 4 mounting holes, and 4 weight-reduction grooves.","First, initialize the modeling environment and draw a 200.0 mm �� 100.0 mm rectangle in the XY plane. Extrude it 80.0 mm in the positive Z direction to generate the base of the manifold block. Next, on the XZ plane (front side) at the center height, drill three horizontal blind holes with a diameter of 20.0 mm at equal intervals as oil inlets, ensuring their depth is sufficient to intersect and connect with the internal longitudinal main oil passage. Then, create a sketch on the top surface and arrange two rows of five circular holes each with a diameter of 10.0 mm. Perform an extruded cut downward until they connect with the internal oil passage network, forming a complete fluid distribution path. At the four corner points of the top surface, use the hole wizard to create four countersunk bolt mounting holes. Finally, on the bottom and side surfaces, avoiding the flow channels, draw four oval contours and perform deep groove operations to reduce weight, completing the overall modeling of the hydraulic manifold block."
L3_24,"The model is designed as a high-performance, low-noise helical tooth synchronous pulley, with an overall appearance featuring streamlined twisted spokes supporting a precision transmission rotary body. The outer diameter of the main rim is set to 120mm, with an effective face width of 40mm. The circumferential surface is equipped with 47 arc teeth based on the HTD 8M standard, with a pitch of 8mm and a tooth depth of 3.4mm. Unlike conventional straight teeth, the grooves of this model are helically distributed along the axial direction, with a helix angle �� of 15 degrees. The tooth centerline follows a helical equation, where the angular offset ���� = Z * tan(15��) / R_pitch in the polar coordinate system, with Z being the coordinate along the face width and R_pitch being the pitch circle radius. This structure endows the model with complex helical swept surfaces.

The rim is not solid but is connected to the central hub via five evenly distributed, variable-section twisted spokes. The outer diameter of the central hub is 45mm, with a cylindrical bore of 25mm in diameter and a 6mm wide keyway. The cross-section of the spokes is an ellipse with a major axis of 12mm and a minor axis of 6mm. This cross-section undergoes a linear twist as it extends from the outer wall of the hub to the inner wall of the rim, with the major axis direction rotating 90 degrees from axial (parallel to the rotation axis) at the hub to circumferential (perpendicular to the rotation axis) at the rim, forming a ruled twisted surface with topological continuity.

At the root connections between the spokes and the hub and rim, there are fillets with a radius of R4mm to ensure smooth transitions. The edges of the rim have a 1.5mm �� 45-degree chamfer. The entire structure integrates helical meshing tooth surfaces with aerodynamic, twisted support structures, forming a complex synchronous pulley model.","First, initialize the modeling environment and draw an annular ring with an outer diameter of 120 mm and a width of 40 mm centered at the origin on the XY reference plane as the rim base. Simultaneously, construct a central hub entity with an outer diameter of 45 mm. For the synchronous belt tooth profile, sketch an arc tooth contour that meets the HTD 8M standard on the rim end face. Then, define a helical sweep path with a helix angle of 15 degrees and a height of 40 mm. Use the sweep and circular array commands to generate 47 helically distributed oblique teeth.

Next, enter the spoke construction phase. Establish reference planes on the outer wall of the hub and the inner wall of the rim. Draw an elliptical section with a major axis of 12 mm and a minor axis of 6 mm. Use the loft command to connect the two sections, constraining the major axis at the start to be axial and rotating the major axis at the end by 90 degrees to be circumferential, achieving a linear twist of the spokes. Then, uniformly array them 5 times around the Z-axis.

Perform an extruded cut at the central hub to create a shaft hole with a diameter of 25 mm and a keyway with a width of 6 mm. Finally, apply a fillet with a radius of 4 mm at the root of all spoke connections for smooth transition, and execute a 1.5 mm by 45-degree chamfer on both edges of the rim to complete the modeling of the entire complex transmission component."
L3_25,"The model is a complex internal combustion engine cylinder head component, made of cast aluminum alloy. The main body has a layered cylindrical structure with dense heat dissipation fins surrounding it. The base of the model is a hollow cylindrical cylinder liner with an outer diameter of 120 millimeters and a height of 100 millimeters. On the outer cylindrical surface of the cylinder liner, 15 annular heat dissipation fins are evenly distributed along the Z-axis, each fin being 2 millimeters thick and extending to an outer diameter of 160 millimeters, with equal-spaced air flow channels between the fins. The top of the cylinder head is a hemispherical combustion chamber cover, with a 14-millimeter-diameter spark plug thread hole at the center of the cover. On both sides of the combustion chamber cover, the intake and exhaust ports are asymmetrically arranged, appearing as short pipe structures extending obliquely outward from the hemisphere. Additionally, at the four quadrant points at the bottom of the cylinder liner, there are bolt holes that run through the entire height for securing the cylinder block. The overall structure, consisting of the central cylinder, 15 layers of heat dissipation fins, the top hemispherical cover, the intake and exhaust pipes, and the four bolt holes, forms a typical multi-feature heat dissipation assembly.","First, draw a concentric circle sketch centered at the origin on the XY reference plane, with an outer diameter set to 120 millimeters. Extrude it 100 millimeters in the positive Z direction to form the hollow cylinder sleeve body. On the outer side wall of the cylinder sleeve, create a circular ring section with an outer diameter of 160 millimeters and a thickness of 2 millimeters by establishing an offset reference plane or directly referencing the outer circumference. Use a linear array feature to uniformly generate 15 layers of heat dissipation fins along the Z-axis, ensuring that equal air channels are formed between the fins. Next, construct a hemispherical solid with a radius of 60 millimeters on the top surface of the cylinder sleeve as the combustion chamber cover, and drill a 14-millimeter-diameter spark plug installation hole vertically downward from the center of its apex. For the intake and exhaust system, establish inclined reference planes at asymmetric positions on both sides of the hemispherical surface, extrude two short tubular structures extending outward, and perform a Boolean union with the hemispherical cover. Finally, precisely locate and cut four bolt column holes longitudinally through the total height of the model at the four quadrant points at the bottom of the cylinder sleeve, thus completing the parametric modeling of the entire multi-feature heat dissipation cylinder head."
L3_26,"The model consists of two eccentric plate-shaped cams mounted coaxially. Both cams have a thickness of 15 millimeters and an axial spacing of 20 millimeters. The profile radius of the main cam varies between 50 millimeters and 90 millimeters, including a 90-degree rise, a 90-degree return, and a 180-degree dwell arc. The rise and return segments are smoothly transitioned using modified sine curves. The profile of the secondary cam is a conjugate based on the geometric relationship of the main cam, ensuring continuous dual-point contact with the follower. The two cams are connected through a central shaft hole with a diameter of 25 millimeters, which has a rectangular keyway machined inside, 6 millimeters wide and 6 millimeters deep. All edges of the cams are chamfered by 1 millimeter.","First, select the XY plane as the starting reference surface in the modeling environment and draw a closed contour sketch of the main cam. The contour consists of a 180-degree dwell arc and rise and return segments, each occupying 90 degrees, connected by a modified sine curve. The radial distance smoothly varies between 50.0 mm and 90.0 mm. After completing the sketch, extrude it 15.0 mm along the positive Z-axis to form the main cam solid. Next, on a parallel offset plane 35.0 mm from the base of the main cam, draw the conjugate profile sketch of the secondary cam based on the kinematics of two-point contact. Extrude this sketch 15.0 mm along the Z-axis, ensuring a net spacing of 20.0 mm between the two cams. Then, at the origin, draw a circular hole sketch with a diameter of 25.0 mm, including a rectangular keyway feature with a width and depth of 6.0 mm. Perform a through-length extrusion cut on both solids to form the central shaft hole. Finally, apply a 1.0 mm chamfer to all outer edges and hole edges of the two cam solids to complete the precise modeling of the conjugate cam assembly."
L3_27,"The model is a complex six-way valve body housing, with a core consisting of a cubic base block with a side length of 60 millimeters. For aesthetics and fluid flow, all eight corners are rounded to make it nearly spherical. At the center of each of the six faces (top, bottom, left, right, front, back), a cylindrical pipe interface extends perpendicularly. The top and bottom interfaces serve as the inlet and outlet, with an outer diameter of 40 millimeters and a length of 30 millimeters, and each has a square flange (60x60mm) at the end. The front, back, left, and right interfaces serve as distribution ports, with an outer diameter of 30 millimeters and a length of 25 millimeters, and each has a circular flange (diameter 50mm) at the end. Each flange has four bolt holes. Inside the base block, there is a spherical cavity with a diameter of 40 millimeters, and all six pipes are connected to this cavity, forming a complex cross-flow channel. Additionally, at the four corners where the top and bottom pipes connect to the base block, triangular reinforcing ribs are added to enhance structural strength.","First, create a reference solid in the form of a cube with an edge length of 60.0 millimeters at the origin of the spatial coordinate system, and apply large-radius fillets to its eight vertices to make the overall contour more spherical. Perform a Boolean subtraction operation at the center of the cube to remove a sphere with a diameter of 40.0 millimeters, forming the central cavity. Next, extend cylindrical bodies with an outer diameter of 40.0 millimeters and a length of 30.0 millimeters from the top and bottom faces of the cube, and construct square flanges with dimensions of 60.0x60.0 millimeters at the ends. Simultaneously, extend cylindrical bodies with an outer diameter of 30.0 millimeters and a length of 25.0 millimeters from the front, back, left, and right sides, and construct circular flanges with a diameter of 50.0 millimeters at the ends. Model through-holes for all six interfaces to ensure that the flow channels reach the central spherical cavity, and arrange four bolt mounting holes on each flange according to standard spacing. Finally, add triangular reinforcement plates at the four corner positions where the upper and lower pipes meet the base block to complete the structural reinforcement and detail construction of the valve body housing."
L3_28,"This is an L-shaped bearing housing designed to support a pair of vertically meshing bevel gears. The model consists of two components: a horizontal base and a vertical support plate.

The horizontal base is a square flange measuring 100 mm �� 100 mm with a thickness of 15 mm. It features a central through-hole of 50 mm diameter, surrounded by a raised bearing hub (outer diameter: 70 mm, height: 10 mm).
The vertical support plate has a thickness of 20 mm, is mounted upright along one edge of the base, and extends to a height of 120 mm. At its upper section, a horizontal through-bore for the bearing is provided, configured as a boss feature with an outer diameter of 70 mm and an inner bore diameter of 40 mm. The centerline of this bore is positioned 80 mm above the base surface.
A large triangular rib (15 mm thick) reinforces the inner junction between the base and the vertical support plate.
Four mounting holes, each with a diameter of 12 mm, are located at the corners of the base flange.
At the top of the vertical bearing housing, an M8 threaded hole is provided for a grease fitting, which communicates directly with the shaft bore.","Horizontal base: Create a cuboid of 100 mm �� 100 mm �� 15 mm in the XY plane, centered symmetrically.
Base bearing position: Extrude a cylindrical hub with an outer diameter of 70 mm and a height of 10 mm at the center of the top surface of the base, and cut through a through-hole with a diameter of 50 mm.
Vertical support: Extrude a vertical plate upward from the rear edge of the base (maximum Y-axis), with a width of 100 mm, thickness of 20 mm, and height of 120 mm.
Vertical bearing seat: At 80 mm from the bottom surface, generate a horizontal through-bearing seat on the center face of the vertical plate, with an outer diameter of 70 mm and a total length of 30 mm (symmetrically distributed relative to the vertical plate), and cut through a hole with a diameter of 40 mm at the center.
Reinforcing ribs: On the YZ center plane where the base and the vertical plate intersect, draw a right-angled triangle of 50 mm �� 50 mm, and extrude it 15 mm thick on both sides.
Feature refinement: Arrange four mounting holes with a diameter of 12 mm at the corners of the base, spaced 80 mm �� 80 mm apart; machine a through-hole with a diameter of 8 mm (simulating M8) at the exact center of the top of the vertical bearing seat, reaching the inner shaft hole."
L3_29,"The model is a variable-diameter conical corrugated helical spring, with an overall appearance resembling an inverted truncated cone spiral cage structure, designed to provide nonlinear variable stiffness rebound force within a limited axial space. The main body is constructed based on a contracting helical trajectory, with its guide line defined in a cylindrical coordinate system. The polar angle $\theta$ ranges from $0$ to $10\pi$ (i.e., 5 full turns), and the radius of rotation $R$ decreases linearly with the angle, following the equation $R(\theta) = 40 - 1.5(\frac{\theta}{2\pi})$, causing the spring's mid-diameter to smoothly contract from 40mm at the bottom to 32.5mm at the top. On this helical conical surface, high-frequency axial sinusoidal fluctuations are superimposed, with the axial height $Z$ composed of a base helical rise component and a fluctuation component, given by the equation $Z(\theta) = 8(\frac{\theta}{2\pi}) + 2.5 \sin(6\theta)$, indicating an average pitch of 8mm per turn and including 6 full cycles of sinusoidal peaks, with a peak-to-peak amplitude of $\pm 2.5$mm. The cross-sectional feature is a rectangular solid with a width of 8mm and a thickness of 1.2mm. The long side of this rectangular section is always parallel to the global XY plane (maintaining a ""flat"" orientation) and perpendicular to the local radial vector, undergoing rigid sweeping only along the Z-axis. At both ends of the spring, to form stable contact surfaces, the amplitude of the fluctuations is reduced to zero over the last $\pi/2$ angular range through a linear decay factor, and the helical pitch gradually becomes 0, with the end sections perpendicular to the tangent direction of the helix. Overall, it forms a geometrically self-locking, precisely defined conical wave elastic element, strictly defined by parametric equations.","First, define the central guide line of the spring using the equation-driven curve function in a 3D modeling environment. This line is set as a contracting helical path that rotates 5 turns around the Z-axis, with its radius linearly decreasing from 40.0 mm at the bottom to 32.5 mm at the top. When defining the axial height, superimpose a uniform rise of 8.0 mm per turn with a sine wave function of 6 periods per turn, setting the amplitude to 2.5 mm. Specifically, apply decay constraints in the first and last quarter periods to smoothly reduce the amplitude and the rise angle to zero, ensuring the flatness of the end contact surfaces. Next, establish a reference plane at the start of the guide line, and draw a closed rectangular sketch with a width of 8.0 mm and a thickness of 1.2 mm. Set constraints to ensure that the long side of the rectangle remains parallel to the XY reference plane and perpendicular to the radial vector of the path in the horizontal plane. Finally, use the sweep function, with the rectangular sketch as the cross-section and the parameterized conical corrugated curve as the path, to generate the solid, ensuring that the cross-section maintains the preset horizontal orientation throughout the sweep process. This completes the modeling of the precision variable-diameter corrugated helical spring with nonlinear elastic characteristics."
L3_30,"The model is a high-precision mechanical slide base, with an overall rectangular block shape and made of cast iron. The base dimensions are 150 mm in length, 100 mm in width, and 30 mm in height. On the upper surface of the base, along the length (150 mm direction), there is a dovetail guide rail that protrudes. The bottom width of the guide rail is 60 mm, the height is 15 mm, and the side angles are 60 degrees, forming a trapezoidal protrusion for guidance. On both sides of the base (150x30 surfaces), there is a T-slot running the entire length. The T-slot has a mouth width of 10 mm and an internal width of 16 mm, used for installing limit blocks. At the center of the top surface of the dovetail guide rail, there is a countersunk hole with a diameter of 30 mm (the larger hole has a diameter of 40 mm and a depth of 5 mm). Additionally, at each of the four corners of the base, there are countersunk mounting holes with a diameter of 8 mm. At the root of both sides of the dovetail guide rail, there are 2 mm wide and 1 mm deep tool relief grooves (oil grooves). The overall structure consists of the base, dovetail protrusion, side T-slots, central countersunk hole, four corner mounting holes, and oil groove details.","Datum and Base: The XY plane is used as the datum, with the origin (0, 0, 0) of the absolute coordinate system located at the center of the base bottom. Construct a rectangular base that is 150 mm long (along the X-axis), 100 mm wide (along the Y-axis), and 30 mm high (along the Z-axis), with its top surface at Z = 30 mm.

Dovetail Guide: Center the dovetail table on the top surface of the base (Z = 30 mm) and extend it along the entire X direction (full length of 150 mm). The dovetail cross-section is an isosceles trapezoid in the YZ plane, with a base width (lower base) of 60 mm, a height of 15 mm, and the sides inclined at 60�� to the horizontal plane. Therefore, the upper base width is 60 mm - 2 �� (15 mm �� tan 30��) �� 60 mm - 2 �� 8.66 mm �� 42.68 mm. The top surface of the dovetail guide is at Z = 45 mm.

Oil Grooves: Cut two rectangular grooves along the X-axis at the junction of the dovetail inclined surfaces and the top surface of the base (Z = 30 mm) on both sides of the dovetail guide. Each groove is 2 mm wide (along the Y-axis) and 1 mm deep (along the Z-axis), with the bottom of the groove at Z = 29 mm, and the length extends the full length of the dovetail guide (150 mm).

Side T-Slots: On the two Y-direction side surfaces of the base (Y = +50 mm and Y = -50 mm), cut through T-slots along the X-axis. The centerline of the T-slot is at a height of Z = 15 mm. The opening part of the slot is 10 mm wide and 6 mm deep (from the surface to the neck); the widened part below is 16 mm wide and 6 mm deep, with a total cutting depth of 12 mm. The T-slot is 150 mm long and runs through both ends of the base.

Central Hole: At the center of the top surface of the dovetail guide (X = 0, Y = 0, Z = 45 mm), cut a through-hole with a diameter of 30 mm, extending vertically downward (in the negative Z-axis direction) through the entire base (from Z = 45 mm to Z = 0). Additionally, around this through-hole on the top surface (Z = 45 mm), cut a counterbore with a diameter of 40 mm and a depth of 5 mm (the bottom of the counterbore is at Z = 40 mm)."