Gears and transmission
4:1 Spur Gearbox v10 (refined lightweight housing)
- Bounding box
- 91.2 × 76.0 × 57.3 mm
- Engine
- Precision B-rep
- Parameters
- 50
- Published
- November 7, 2026
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The prompt
Refined, lighter 4:1 gearbox: teardrop housing that follows the gears with thin walls, thin floor with bearing and motor bosses, thin cover plate with bearing bosses, rounded ears and edges, lightened output gear. Same internals: 608 bearings on 8 mm aluminum shaft, 3 mm aluminum pinion axle in stacked 683 bearings, EUDAX 24 mm motor, PETG tolerances, M3 inserts.
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 |
| Output gear lightening holes (0 = solid) | 6 | 0 – 10 |
| Added centre distance (backlash) | 0.2 mm | 0 – 0.6 |
| Output gear/spacer bore clearance | 0.2 mm | 0 – 0.4 |
| Pinion bore vs motor shaft (negative = tighter) | 0 mm | -0.1 – 0.3 |
| Pinion bore vs 3 mm axle (negative = tighter) | 0 mm | -0.1 – 0.3 |
| Bearing pocket diametral clearance | 0.2 mm | 0 – 0.4 |
| 608 outer diameter | 22 mm | 22 – 22 |
| 608 bore / aluminum shaft diameter | 8 mm | 8 – 8 |
| 608 width | 7 mm | 7 – 7 |
| Bearing retaining lip thickness | 1.2 mm | 0.8 – 3 |
| 608 lip hole diameter | 16 mm | 12 – 19 |
| 683 outer diameter | 7 mm | 7 – 7 |
| 683 bore / axle diameter | 3 mm | 3 – 3 |
| 683 width (each) | 3 mm | 3 – 3 |
| 683 lip hole diameter | 5 mm | 4 – 6 |
| Pinion stub diameter (bears on inner race) | 5 mm | 4.4 – 5.4 |
| Pinion stub to bearing gap | 0.2 mm | 0.1 – 1 |
| Gear to floor gap / lower spacer thickness | 1.5 mm | 1 – 4 |
| Axial end float | 0.4 mm | 0 – 0.8 |
| Lower spacer OD | 11 mm | 9 – 12 |
| Gear hub height (set screw boss) | 4.5 mm | 3.5 – 8 |
| Gear hub outer diameter | 12 mm | 10 – 12 |
| Gear set-screw tap hole (M3) | 2.5 mm | 2.2 – 3.2 |
| Drive flat depth on aluminum shaft | 0.6 mm | 0.3 – 1.2 |
| Shaft length beyond cover | 20 mm | 8 – 50 |
| Motor shaft diameter | 2 mm | 1.5 – 4 |
| Motor shaft length beyond face | 9.7 mm | 6 – 16 |
| Motor body diameter | 24 mm | 12 – 36 |
| Motor body length | 12.5 mm | 5 – 60 |
| Motor pocket diametral clearance (snug fit) | 0.15 mm | 0 – 0.6 |
| Motor pocket depth | 6 mm | 2 – 7 |
| Pinion lower hub diameter | 9 mm | 7 – 11 |
| Pinion hub lift above motor face | 0.5 mm | 0.2 – 2 |
| Housing wall thickness | 4 mm | 3 – 10 |
| Base floor thickness (between bosses) | 3 mm | 2 – 6 |
| Cover plate thickness (between bosses) | 5 mm | 4.5 – 8 |
| Wall around bearing and motor bosses | 2.5 mm | 2 – 5 |
| Gear tip to wall clearance | 3 mm | 1.5 – 8 |
| Outer edge rounding | 1.5 mm | 0.5 – 3 |
| Ear blend radius | 3 mm | 1 – 5 |
| Base hole for M3 heat-set insert | 4.2 mm | 3.8 – 4.6 |
| Insert length (hole depth) | 5.7 mm | 4 – 8 |
| Extra depth below insert | 2.5 mm | 0.5 – 4 |
| Cover M3 clearance hole | 3.5 mm | 3.2 – 3.8 |
| Cover bolt head counterbore diameter | 6.4 mm | 5.5 – 8 |
| Cover bolt head counterbore depth | 3.2 mm | 2.5 – 3.5 |
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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