Gears and transmission
Two-Stage Spur Gear Reduction Assembly
- Bounding box
- 21.0 × 21.0 × 8.0 mm
- Engine
- Precision B-rep
- Parameters
- 10
- Published
- August 15, 2026
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The prompt
Design a 2-stage spur gear reduction set for 3D printing with an overall 10:1 ratio. Stage 1: A 12-tooth pinion driving a 36-tooth gear (3:1). Stage 2: A 12-tooth pinion coupled to a 40-tooth gear (3.33:1). Module: 1.5 mm. Pressure angle: 20 degrees. Face width (gear thickness): 8 mm. Central shaft bore: 5 mm diameter with a 0.2 mm 3D-printing tolerance. Include standard involute tooth profiles with a 0.25 mm backlash clearance between meshing teeth. Flat base on one side for bed adhesion without supports.
Parameters
| Name | Value | Range |
|---|---|---|
| Stage 1 Pinion Teeth | 12 teeth | 8 – 30 |
| Stage 1 Gear Teeth | 36 teeth | 24 – 100 |
| Stage 2 Pinion Teeth | 12 teeth | 8 – 30 |
| Stage 2 Gear Teeth | 40 teeth | 24 – 120 |
| Module | 1.5 mm | 0.8 – 3 |
| Pressure Angle | 20 deg | 10 – 30 |
| Face Width | 8 mm | 2 – 20 |
| Shaft Bore Diameter | 5.2 mm | 3 – 12 |
| Backlash | 0.25 mm | 0 – 0.5 |
| Stage 2 Axial Offset | 8 mm | 8 – 30 |
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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