Gears and transmission
Going Barrel with Integral Spur Gear
- Bounding box
- 54.4 × 54.4 × 14.8 mm
- Engine
- Precision B-rep
- Parameters
- 18
- Published
- October 18, 2026
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The prompt
Create a parametric CAD model (units: millimetres, export STEP) of a spring-driven "going barrel" wind-up mechanism for a rear-wheel-drive toy car. Model each part as a separate solid and place them in an assembly. Use exactly these dimensions. PART 1 - BARREL (brass): cylinder, total width 14.8. Bottom plate 3.0 thick, bore diameter 38 H7, bore depth 11.8 from the open face. Centre hole diameter 12 H7 through the bottom plate. External spur gear on the rim: module 0.8, 66 teeth, 20 degree pressure angle, tip diameter 54.4, root diameter 50.8, pitch diameter 52.8, face width 8 (from 3.0 to 11.0 measured from the bottom face). Four tapped holes M2.5, 7 deep, on a 44 diameter bolt circle at 45/135/225/315 degrees on the open face. One radial hole diameter 2 through the rim at 8.4 from the bottom face, at 90 degrees (top).
Parameters
| Name | Value | Range |
|---|---|---|
| Total Width | 14.8 mm | 8 – 30 |
| Bottom Plate Thickness | 3 mm | 1 – 8 |
| Bore Diameter (38 H7) | 38 mm | 10 – 46 |
| Bore Depth From Open Face | 11.8 mm | 2 – 29 |
| Centre Hole Diameter (12 H7) | 12 mm | 2 – 20 |
| Gear Module | 0.8 mm | 0.3 – 2 |
| Number of Teeth | 66 teeth | 10 – 120 |
| Pressure Angle | 20 deg | 14.5 – 25 |
| Gear Face Width | 8 mm | 1 – 20 |
| Gear Start Height From Bottom | 3 mm | 0 – 15 |
| Tapped Hole Bolt Circle | 44 mm | 20 – 50 |
| Number of Tapped Holes | 4 holes | 1 – 8 |
| First Hole Angle | 45 deg | 0 – 90 |
| Tapped Hole Tap-Drill Dia (M2.5) | 2.05 mm | 1 – 4 |
| Tapped Hole Depth | 7 mm | 1 – 12 |
| Radial Rim Hole Diameter | 2 mm | 0.5 – 6 |
| Radial Hole Height | 8.4 mm | 1 – 14 |
| Radial Hole Angle | 90 deg | 0 – 360 |
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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