Enclosures and housings
Spring-Driven Going Barrel Assembly
- Bounding box
- 33.6 × 33.6 × 22.0 mm
- Engine
- Precision B-rep
- Parameters
- 34
- Published
- October 22, 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 4 - RATCHET WHEEL (steel), 4 thick, bore 8 H7, 24 teeth, outer diameter 24, root diameter 20. One tooth: root at radius 10 / 0 degrees, tip at radius 12 / 2.25 degrees, next root at radius 10 / 15 degrees. Pattern 24 times.
Parameters
| Name | Value | Range |
|---|---|---|
| Barrel OD | 32 mm | 20 – 60 |
| Barrel Height | 10 mm | 5 – 30 |
| Barrel Wall | 2 mm | 1 – 5 |
| Output Gear Teeth | 40 teeth | 12 – 80 |
| Output Gear Module | 0.8 mm | 0.3 – 2 |
| Output Gear Width | 2 mm | 1 – 6 |
| Mainspring Thickness | 0.5 mm | 0.1 – 1.5 |
| Mainspring Height | 8 mm | 2 – 20 |
| Mainspring Outer Diameter | 28 mm | 10 – 50 |
| Mainspring Inner Diameter | 8 mm | 4 – 20 |
| Mainspring Turns | 4 turns | 1 – 10 |
| Arbor Diameter | 8 mm | 3 – 20 |
| Arbor Length | 22 mm | 10 – 60 |
| Square End Size | 6 mm | 2 – 15 |
| Square End Length | 4 mm | 1 – 10 |
| Cover OD | 30 mm | 15 – 60 |
| Cover Thickness | 2 mm | 1 – 8 |
| Cover Center Hole Diameter | 8.2 mm | 2 – 20 |
| Cover Mounting Hole Diameter | 2.5 mm | 1 – 8 |
| Cover Mounting Hole Count | 4 count | 2 – 12 |
| Cover Bolt Circle Diameter | 20 mm | 10 – 50 |
| Ratchet Thickness | 4 mm | 1 – 12 |
| Ratchet Bore Diameter | 8 mm | 2 – 20 |
| Ratchet Teeth | 24 teeth | 6 – 60 |
| Ratchet Root Diameter | 20 mm | 5 – 60 |
| Ratchet Tip Diameter | 24 mm | 6 – 70 |
| Ratchet Tip Angle | 2.25 deg | 0.5 – 10 |
| Pawl Length | 12 mm | 5 – 30 |
| Pawl Width | 5 mm | 2 – 15 |
| Pawl Thickness | 2 mm | 0.5 – 8 |
| Pawl Pivot Hole Diameter | 2 mm | 0.5 – 8 |
| Pawl Pivot Offset | 4 mm | 0 – 5 |
| Pawl Spring Length | 6 mm | 2 – 20 |
| Pawl Spring Diameter | 2 mm | 0.5 – 8 |
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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