Gears and transmission
Wooden Trailing Suspension Arm
- Bounding box
- 240.0 × 40.0 × 35.0 mm
- Engine
- Precision B-rep
- Parameters
- 17
- Published
- November 2, 2026
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The prompt
Design a wooden trailing suspension arm for an RC crawler chassis, flat bar geometry, 20mm thick. Overall arm length (pivot center to wheel hub center): [ARM_LENGTH]mm, e.g. 180mm Arm width: 40mm, rounded ends with 10mm radius Features, in order from pivot end to wheel end: 1. Pivot bore: 6mm diameter through-hole, centered 20mm from the pivot end, for a suspension pivot bolt. 2. Shock mount hole: 5mm diameter through-hole, offset 15mm above the arm centerline, located 60mm from the pivot end. 3. Motor pocket: circular counterbore, 36mm diameter, 25mm deep, centered on the arm's width, located 40mm from the wheel end, for a planetary geared DC motor housing (flush-mount, flat bottom). 4. Motor shaft clearance hole: 10mm diameter through-hole, concentric with the motor pocket center, through the remaining arm thickness, to pass an 8mm D-cut output shaft. 5. Bearing bore: 22mm diameter counterbore, 8mm deep, on the opposite face from the motor pocket, concentric with the same center axis as the motor pocket and shaft hole, for an 8mm pillow-block bearing insert. 6. Wheel hub bore: 8mm diameter through-hole with a flat D-cut side (1mm flat depth), centered at the wheel end, [WHEEL_HUB_OFFSET]mm from the arm's end edge, e.g. 15mm — this must be perfectly concentric with the motor pocket and bearing bore, all sharing one axis perpendicular to the arm's flat face. Material: birch plywood or hardwood, flat plate stock. Export as STEP and STL.
Parameters
| Name | Value | Range |
|---|---|---|
| Arm length (pivot to wheel hub) | 180 mm | 120 – 300 |
| Arm width | 40 mm | 20 – 60 |
| Arm thickness | 35 mm | 25 – 50 |
| Pivot bore diameter | 6 mm | 4 – 10 |
| Pivot bore X from pivot end | 20 mm | 10 – 30 |
| Shock mount hole diameter | 5 mm | 3 – 8 |
| Shock hole X from pivot end | 60 mm | 30 – 120 |
| Shock hole Y offset from centerline | 15 mm | 5 – 20 |
| Motor pocket diameter | 36 mm | 20 – 50 |
| Motor pocket depth | 25 mm | 10 – 30 |
| Motor pocket & hub distance from wheel end | 40 mm | 20 – 60 |
| Motor shaft clearance hole diameter | 10 mm | 6 – 14 |
| Bearing bore diameter | 22 mm | 10 – 30 |
| Bearing bore depth | 8 mm | 3 – 15 |
| Wheel hub bore diameter | 8 mm | 5 – 12 |
| D-cut flat depth | 1 mm | 0.5 – 2 |
| End fillet radius | 10 mm | 4 – 15 |
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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