Gears and transmission
Involute Spur Gear Pair m3 20T / 40T
- Bounding box
- 185.6 × 125.9 × 28.0 mm
- Engine
- 3D Printing B-rep
- Parameters
- 15
- Published
- November 14, 2026
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The prompt
A pair of meshing involute spur gears with a 3 mm module and 20-degree pressure angle, positioned at a center distance of 90 mm. On the left, a driving pinion gear with 20 teeth, 60 mm pitch diameter, 20 mm face width, a 20 mm central bore, and a 6 mm wide rectangular keyway. On the right, meshing with the pinion, a driven spur gear with 40 teeth, 120 mm pitch diameter, 20 mm face width, a 25 mm central bore with an 8 mm wide rectangular keyway, and a raised cylindrical hub of 45 mm outer diameter protruding 8 mm from the front face.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 3 mm | 1 – 6 |
| Pressure angle | 20 deg | 14.5 – 25 |
| Tooth count | 20 mm | 10 – 40 |
| Face width | 20 mm | 5 – 60 |
| Bore diameter | 20 mm | 6 – 40 |
| Keyway width | 6 mm | 2 – 14 |
| Keyway depth | 3 mm | 1 – 8 |
| Tooth count | 40 mm | 12 – 80 |
| Face width | 20 mm | 5 – 60 |
| Bore diameter | 25 mm | 6 – 50 |
| Keyway width | 8 mm | 2 – 16 |
| Keyway depth | 3.5 mm | 1 – 8 |
| Hub diameter | 45 mm | 25 – 90 |
| Hub protrusion from front face | 8 mm | 0 – 20 |
| Centre distance | 90 mm | 20 – 250 |
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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