Gears and transmission
Oil-Tight Herringbone Gearbox with 24 mm Motor Mount
- Bounding box
- 92.5 × 97.7 × 108.3 mm
- Engine
- Precision B-rep
- Parameters
- 33
- Published
- November 9, 2026
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The prompt
Oil-tight version of the two-stage herringbone gearbox: TPU flat gasket between the base and cover, TPU lip seals on the input shaft (floor) and on the output shaft (cover top), M5 fill plug in the cover and M5 drain plug in the floor each with a TPU washer, blind insert and dowel holes so no bolt path leaks, plus the clamped 24 mm DC motor tower (split clamp with M3 bolt and nut trap, 3 mm to 2 mm shaft adapter) under the input shaft
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 once the gasket is squeezed (lets herringbone gears centre themselves) | 0.4 mm | 0.2 – 0.8 |
| 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 |
| TPU flat gasket thickness (about 25 percent squeezes out when the cover is bolted down) | 1 mm | 0.6 – 1.6 |
| Hole for the M5 heat-set insert of the fill and drain plugs | 6.4 mm | 5.8 – 7 |
| Motor body diameter | 24 mm | 20 – 28 |
| Motor pocket clearance (diametral) | 0.15 mm | 0.05 – 0.4 |
| Motor body length | 12.5 mm | 10 – 30 |
| Motor shaft length | 9.7 mm | 6 – 14 |
| Adapter bore clearance on the shafts (diametral; glue them) | 0.05 mm | 0 – 0.2 |
| 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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