Gears and transmission
4:1 Spur Gearbox v9 (no motor grub screws)
- Bounding box
- 103.2 × 88.0 × 57.3 mm
- Engine
- Precision B-rep
- Parameters
- 45
- Published
- November 7, 2026
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The prompt
Precision 4:1 gearbox: 608 bearings on 8 mm aluminum output shaft; 3 mm aluminum pinion axle in stacked 683 bearings; EUDAX 24 mm motor held in a snug base pocket (no grub screws); PETG tolerances; M3 inserts and cover bolts
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) | 0.2 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 |
| 608 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 | 10 mm | 8 – 14 |
| Gear tip to wall clearance | 3 mm | 1.5 – 8 |
| Housing corner radius | 5 mm | 0 – 8 |
| 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 – 4 |
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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