Gears and transmission
Planetary Gear Set (18T / 3x24T / 66T, i = 4.67)
- Bounding box
- 72.0 × 72.0 × 50.0 mm
- Engine
- Precision B-rep
- Parameters
- 20
- Published
- September 15, 2026
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The prompt
Central sun gear Has 18 teeth 3 surrounding planet gears Each gear has 24 teeth Outer ring gear Has 66 teeth Precise meshing condition 66 equals 18 plus 2 times 24 Ring gear held stationary Motor drives the central sun gear 3 small gears rotate on their own pins While revolving inside the outer ring gear Carrier connecting 3 planet gears rotates slower Reduction gear ratio is 4.67 Input motor completes 4.67 rotations Output shaft turns exactly 1 rotation
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 1 mm | 0.5 – 4 |
| Pressure Angle | 20 deg | 14.5 – 25 |
| Sun Teeth | 18 teeth | 8 – 40 |
| Planet Teeth | 24 teeth | 8 – 40 |
| Ring Teeth | 66 teeth | 24 – 120 |
| Sun / Planet Thickness | 10 mm | 4 – 30 |
| Ring Gear Thickness | 12 mm | 4 – 30 |
| Ring Gear Outer Dia | 72 mm | 40 – 200 |
| Sun Bore | 6 mm | 0 – 20 |
| Planet Bore | 4 mm | 0 – 20 |
| Planet Orbit / Pin Radius | 21 mm | 6 – 60 |
| Carrier Plate Dia | 50 mm | 20 – 140 |
| Carrier Plate Thickness | 6 mm | 2 – 20 |
| Carrier Hub Dia | 18 mm | 8 – 40 |
| Carrier Hub Height | 10 mm | 4 – 30 |
| Planet Pin Dia | 4 mm | 1 – 15 |
| Planet Pin Length | 20 mm | 5 – 60 |
| Input Shaft Dia | 6 mm | 2 – 20 |
| Output Shaft Dia | 8 mm | 2 – 25 |
| Shaft Length | 25 mm | 5 – 80 |
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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