Gears and transmission
Chainable Coaxial Oil-Tight Gearbox with Guide Rail
- Bounding box
- 281.8 × 121.7 × 78.5 mm
- Engine
- Precision B-rep
- Parameters
- 35
- Published
- November 9, 2026
Download
Free to download and use. See the terms.
The prompt
End-to-end chainable version of the oil-tight mostly-printed herringbone gearbox. The two stages are now coaxial (input and output on the same centre line, countershaft beside them), the housing lies on its side on the table as a flat-bottomed stadium, and a printed coupler joins the output of one gearbox to the input of the next so the shafts run in one straight line. A guide rail with one key block per gearbox holds them in line. Motor tower on the first gearbox only (switchable), TPU gasket, TPU lip seals, fill plug on top, drain plug low on the end face.
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 |
| 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 floor / cover | 2 mm | 1.5 – 4 |
| 608 bearing pocket diametral clearance | 0.15 mm | 0.05 – 0.3 |
| Printed 6 mm journal clearance in its bushing hole (diametral; oil fills it) | 0.3 mm | 0.2 – 0.5 |
| Output gear and spacer bore clearance on the 8 mm rod (diametral) | 0.15 mm | 0.05 – 0.3 |
| Axial end float once the gasket is squeezed (lets herringbone gears centre themselves) | 0.4 mm | 0.2 – 0.8 |
| Motor tower on the input end (1 for the first gearbox, 0 for a gearbox that is driven through a coupler) | 1 | 0 – 1 |
| Length of the output rod and the input stub sticking out for the coupler | 19 mm | 12 – 30 |
| Drive flat depth on the 8 mm shaft | 0.6 mm | 0.3 – 1.2 |
| Number of gearbox positions on the guide rail | 3 | 1 – 6 |
| Table screw clearance hole (M4) | 4.5 mm | 4 – 5.5 |
| 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 |
| Socket clearance on the 2 mm motor shaft and coupler bore clearance (diametral; glue it) | 0.05 mm | 0 – 0.2 |
| Printed alignment peg diameter (replaces the dowels) | 4 mm | 3 – 5 |
| 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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