Gears and transmission
4:1 Spur Gearbox (608 bearings, 3 mm motor input)
- Bounding box
- 101.1 × 86.0 × 77.0 mm
- Engine
- Precision B-rep
- Parameters
- 31
- Published
- November 7, 2026
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The prompt
Precision 4:1 gearbox using 608 bearings and a 3mm DC motor input shaft, with gears stable inside the housing
Parameters
| Name | Value | Range |
|---|---|---|
| Gear module | 1 mm | 0.8 – 2 |
| Pinion teeth | 15 | 12 – 24 |
| Reduction ratio (x:1) | 4 | 2 – 6 |
| Gear face width | 8 mm | 4 – 14 |
| Added centre distance (backlash) | 0.1 mm | 0 – 0.5 |
| Bore clearance on shafts | 0.1 mm | 0 – 0.3 |
| 608 outer diameter | 22 mm | 22 – 22 |
| 608 bore / output shaft diameter | 8 mm | 8 – 8 |
| 608 width | 7 mm | 7 – 7 |
| Pocket diametral clearance | 0.05 mm | 0 – 0.3 |
| Retaining lip thickness | 1 mm | 0.8 – 3 |
| Lip hole diameter | 16 mm | 12 – 19 |
| Gear to wall gap | 1.5 mm | 1 – 4 |
| Shaft end float | 0.2 mm | 0 – 0.6 |
| Shaft shoulder / spacer OD | 11 mm | 9 – 12 |
| Drive flat depth on output shaft | 0.6 mm | 0.3 – 1.2 |
| Output shaft length beyond cover | 20 mm | 8 – 50 |
| Motor shaft diameter | 3 mm | 2 – 4 |
| Motor shaft length | 12 mm | 8 – 16 |
| Motor body diameter | 24 mm | 12 – 36 |
| Motor body length | 30 mm | 15 – 60 |
| Motor bolt spacing | 18 mm | 14 – 24 |
| Motor bolt hole diameter | 3.2 mm | 2 – 4 |
| Motor bolt counterbore diameter | 6 mm | 4 – 7 |
| Pinion lower hub diameter | 9 mm | 7 – 11 |
| Pinion hub lift above motor face | 0.5 mm | 0.2 – 2 |
| Housing wall thickness | 9 mm | 7 – 14 |
| Gear tip to wall clearance | 3 mm | 1.5 – 8 |
| Housing corner radius | 5 mm | 0 – 8 |
| Cover bolt clearance hole | 4.5 mm | 3.4 – 5.5 |
| Base bolt tap hole (M4) | 3.4 mm | 2.5 – 4.2 |
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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