Gears and transmission
Cycloidal Gearbox, Printed Ring Pins, Tested (15:1)
- Bounding box
- 83.1 × 83.5 × 86.3 mm
- Engine
- Precision B-rep
- Parameters
- 27
- Published
- November 9, 2026
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The prompt
Cycloidal gearbox for a 24 mm DC motor, printed ring pins, after test fixes: the disc profile is now relieved by a printing clearance (the exact profile touches the pins and would bind), the output-pin holes have more slack, and the base-plate lip under the output bearing no longer touches the bearing's inner race. 15:1, two 180-degree discs on a printed eccentric cam with 608 bearings, six 3 mm output pins, 8 mm output rod, clamped motor tower on top.
Parameters
| Name | Value | Range |
|---|---|---|
| Ring pins (an even number; reduction is pins minus 1) | 16 | 12 – 30 |
| Ring pin circle radius | 26 mm | 24 – 34 |
| Printed ring pin diameter | 4 mm | 3 – 5 |
| Eccentricity (keep it under pin circle radius divided by pins) | 1 mm | 0.6 – 1.4 |
| Printing clearance cut off the disc profile all round (0 would touch the pins and bind) | 0.2 mm | 0.1 – 0.4 |
| Disc thickness | 8 mm | 8 – 10 |
| Output pin circle radius | 16 mm | 15 – 18 |
| Output pins | 6 | 4 – 8 |
| Clearance around each output pin inside its disc hole (diametral; slack per side is half of this) | 0.5 mm | 0.2 – 0.8 |
| 608 bearing pocket diametral clearance | 0.15 mm | 0.05 – 0.3 |
| Cam journal undersize in the bearing bore (diametral) | 0.1 mm | 0.05 – 0.3 |
| Output rod bore clearance (diametral) | 0.15 mm | 0.05 – 0.3 |
| Wall outside the ring pins | 7.5 mm | 6 – 12 |
| Output rod length sticking out of the bottom | 25 mm | 10 – 50 |
| Drive flat depth on the 8 mm rod | 0.6 mm | 0.3 – 1.2 |
| 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 (diametral; glue it) | 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 | 1.5 mm | 0.5 – 3 |
| 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 |
| Mounting ear screw hole (M4) | 4.5 mm | 4 – 5.5 |
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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