Gears and transmission
Wind-Up Mechanism Assembly
- Bounding box
- 68.0 × 78.0 × 27.0 mm
- Engine
- Precision B-rep
- Parameters
- 33
- Published
- October 18, 2026
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The prompt
Design a compact mechanical wind-up mechanism with a spring housing. Design requirements: Maximum overall footprint: 68 mm × 78 mm. The entire mechanism, including all gears, shafts, spring housing, and structural supports, must fit within this rectangular boundary. Spring housing: An internal diameter of 38 mm to accommodate the mainspring. Position the spring inside this housing. Mechanism type: A mechanical wind-up system using a mainspring to store rotational energy and release it through a gear train. Compact layout: Arrange all components efficiently within the available space. Avoid any components extending beyond the 68 × 78 mm footprint. Mechanical functionality: Include a central spring arbor, suitable gear connections, shaft supports, and a practical method for winding and releasing the spring. 3D CAD design: Generate a complete, dimensionally accurate 3D assembly with separate components where appropriate. Clearance: Allow sufficient space between moving parts to prevent interference and ensure smooth rotation. Manufacturability: Use practical shapes and realistic mechanical geometry suitable for 3D printing or further mechanical engineering development. Prioritize fitting the complete mechanism inside the 68 × 78 mm footprint while maintaining the 38 mm internal-diameter spring housing. Start with a simple functional layout. If the complete mechanism cannot fit within the specified dimensions, identify the conflicting components and suggest an alternative arrangement rather than exceeding the maximum footprint.
Parameters
| Name | Value | Range |
|---|---|---|
| Base Plate Length | 68 mm | 50 – 100 |
| Base Plate Width | 78 mm | 50 – 120 |
| Base Plate Thickness | 3 mm | 1 – 10 |
| Spring Housing OD | 44 mm | 30 – 60 |
| Spring Housing ID | 38 mm | 20 – 50 |
| Spring Housing Depth | 12 mm | 5 – 20 |
| Mainspring OD | 38.2 mm | 20 – 45 |
| Mainspring ID | 12 mm | 5 – 20 |
| Mainspring Height | 8 mm | 4 – 15 |
| Arbor Diameter | 6 mm | 3 – 10 |
| Arbor Length | 23.2 mm | 10 – 30 |
| Drive Gear Diameter | 34 mm | 20 – 50 |
| Drive Gear Teeth | 34 teeth | 10 – 60 |
| Drive Gear Thickness | 4 mm | 2 – 10 |
| Ratchet Wheel Diameter | 14 mm | 8 – 25 |
| Ratchet Teeth | 12 teeth | 6 – 24 |
| Ratchet Thickness | 3 mm | 1 – 8 |
| Compound Pinion Diameter | 10 mm | 5 – 20 |
| Compound Pinion Teeth | 10 teeth | 6 – 20 |
| Compound Upper Gear Diameter | 14 mm | 8 – 25 |
| Compound Upper Gear Teeth | 14 teeth | 6 – 30 |
| Compound Gear Total Height | 6 mm | 3 – 12 |
| Output Gear Diameter | 10 mm | 5 – 20 |
| Output Gear Teeth | 10 teeth | 6 – 20 |
| Output Gear Thickness | 4 mm | 2 – 8 |
| Pawl Length | 8 mm | 4 – 15 |
| Pawl Width | 5 mm | 3 – 10 |
| Pawl Thickness | 3 mm | 1 – 8 |
| Shaft Pin Diameter | 4 mm | 2 – 8 |
| Shaft Pin Length | 21.4 mm | 10 – 30 |
| Top Bridge Length | 46 mm | 30 – 60 |
| Top Bridge Width | 24 mm | 15 – 35 |
| Top Bridge Thickness | 3 mm | 1 – 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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