Gears and transmission
Vertical Slider Crank Mechanism
- Bounding box
- 100.0 × 54.0 × 136.0 mm
- Engine
- Precision B-rep
- Parameters
- 14
- Published
- November 9, 2026
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The prompt
Design 3 parts to add a vertical slider-crank mechanism to an existing robot. Existing robot: two parallel vertical guide rods (diameter 8 mm, centre distance 70 mm, along Z) held by a bracket; a gearmotor sits on the bracket with its shaft horizontal (along Y, shaft diameter 6 mm with a flat), centred between the two rods. The mechanism must convert the motor rotation into a vertical translation of EXACTLY 40 mm along the rods. Units: mm. Export STEP for each part. COORDINATES: origin = motor shaft axis. Z up. The two rods are at x = -35 and x = +35. The crank turns in the XZ plane (shaft along Y). 1) CRANK [Crank] - Disc diameter 40 mm, thickness 5 mm, with a hub 14 mm diameter x 12 mm long. - Central bore 6 mm with a flat (D-shape), plus one M3 radial hole in the hub for a set screw. - One crank-pin hole of 4.1 mm diameter at EXACTLY 20 mm from the centre. - Disc diameter must stay below 60 mm so it clears the rods (rods at +/-35 mm, radius 4 mm). - Fillets R1. 2) CONNECTING ROD [Con_Rod] - Flat bar 12 mm wide x 5 mm thick, 70 mm between the two hole centres. - Ends fully rounded (R6), 4.1 mm hole in each end, fillets R0.5. - Must be narrow enough to pass between the two rods. 3) SLIDER WITH GRIP [Slider] - Block 30 (X) x 24 (Y) x 18 (Z) mm... see note below. - Two vertical through-holes of 8.2 mm diameter at x = -35 and x = +35 mm (centre distance 70 mm) so the block slides on the two rods. - On the top face, in the middle, a clevis: two ears 4 mm thick, gap 5.2 mm, 10 mm high, with a 4.1 mm hole along Y for the connecting rod. - On the bottom face: a flat gripper plate 50 (X) x 45 (Z) x 3 mm attached with two M3 holes, corners R3. - Dimension the slider so it spans from x = -50 to x = +50. NOTE: the slider body is a rectangular block 100 (X) x 24 (Y) x 18 (Z) mm with the two rod holes at x = -35 and x = +35, the clevis at x = 0, and chamfers 1 mm on outer edges. Strict geometry: slider midpoint (centre of stroke) is 70 mm below the motor axis, at z = -70. At the retracted end the slider centre is at z = -50, at the extended end z = -90 (stroke = 40 mm).
Parameters
| Name | Value | Range |
|---|---|---|
| Crank Radius | 20 mm | 10 – 28 |
| Crank Disc Diameter | 40 mm | 30 – 55 |
| Crank Disc Thickness | 5 mm | 3 – 10 |
| Hub Diameter | 14 mm | 10 – 20 |
| Hub Length | 12 mm | 8 – 20 |
| Connecting Rod Length | 70 mm | 50 – 100 |
| Connecting Rod Width | 12 mm | 8 – 20 |
| Connecting Rod Thickness | 5 mm | 3 – 10 |
| Pin Hole Diameter | 4.1 mm | 3 – 6 |
| Slider Width (X) | 100 mm | 80 – 120 |
| Slider Depth (Y) | 24 mm | 18 – 35 |
| Slider Height (Z) | 18 mm | 12 – 30 |
| Guide Rod Spacing | 70 mm | 50 – 90 |
| Guide Hole Diameter | 8.2 mm | 6 – 12 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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