Gears and transmission
Herringbone Gearbox 9.4:1 (608 + 683 bearings)
- Bounding box
- 88.7 × 97.7 × 93.0 mm
- Engine
- Precision B-rep
- Parameters
- 27
- Published
- November 8, 2026
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The prompt
3D-printed two-stage herringbone gearbox (about 9.4:1) using 608 and 683 bearings and 1 mm, 3 mm and 8 mm rod: input shaft (3 mm) and output shaft (8 mm) each supported at both ends, a 3 mm countershaft, genuinely twisted herringbone gears (helix angle now given in degrees so the teeth really are helical) with no axial thrust and axisymmetric lightening, hunting-tooth ratios, 0.2 mm backlash, axial float and a housing whose bearing seats are all printed in two parts located by dowels so nothing binds
Parameters
| Name | Value | Range |
|---|---|---|
| Gear module | 1 mm | 0.8 – 1.5 |
| Pinion teeth (both stages) | 16 | 14 – 22 |
| Gear teeth (both stages; keep it coprime with the pinion for even wear) | 49 | 36 – 64 |
| Helix angle of each half of the herringbone | 25 deg | 15 – 35 |
| Gear face width (both halves together) | 12 mm | 8 – 16 |
| Added centre distance (backlash) | 0.2 mm | 0.1 – 0.4 |
| Web thickness of the big gears (lightening, symmetric so they stay balanced) | 3 mm | 2 – 6 |
| Rim thickness under the teeth of the big gears | 4 mm | 3 – 6 |
| Angle at the countershaft between input and output shaft (180 would be in a line) | 90 deg | 80 – 150 |
| Housing wall thickness | 4 mm | 3 – 8 |
| Gear tip to housing wall | 3 mm | 2 – 6 |
| Gap between the two gear layers | 2 mm | 1.5 – 4 |
| Gap between the gears and the bearing faces (spacer length) | 2 mm | 1.5 – 4 |
| 683 bearings stacked at each end of the 3 mm shafts (1 or 2) | 2 | 1 – 2 |
| Bearing pocket diametral clearance | 0.15 mm | 0.05 – 0.3 |
| Gear and spacer bore clearance on the shafts (diametral) | 0.15 mm | 0.05 – 0.3 |
| Axial end float of every shaft (lets herringbone gears centre themselves) | 0.4 mm | 0.2 – 0.8 |
| Input shaft length sticking out of the bottom | 20 mm | 10 – 40 |
| Output shaft length sticking out of the top | 25 mm | 10 – 50 |
| Drive flat depth on the 3 mm shafts | 0.4 mm | 0.2 – 0.8 |
| Drive flat depth on the 8 mm shaft | 0.6 mm | 0.3 – 1.2 |
| 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 the insert | 2.5 mm | 0.5 – 4 |
| M3 clearance hole | 3.5 mm | 3.2 – 3.8 |
| Bolt head counterbore diameter | 6.4 mm | 5.5 – 8 |
| 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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