This is a steel gearset for a 6x planetary gearbox, like used in the qdd100 and other Mini-Cheetah style servos. It fits inside the stator of 8108 and larger sized motors. They use a non-standard center distance of 29.85mm (standard for this geometry is 30.0mm).
It includes 1 ring gear, 1 sun gear, and 3 planet gears.
Ring gear specifications:
- 100 tooth
- OD: 55mm +-0/-0.02
- Width: 5mm
- Mass: 15.0g
Sun gear specifications:
- 20 tooth
- Tooth width: 5mm
- Hub width: 7mm
- Hub diameter: 8mm +0/-0.02
- Bore diameter: 4mm +0.02/-0.0
- Mass: 4.5g
Planet gear specifications:
- 40 tooth
- Tooth width: 5mm
- Hub width: 3mm
- Hub diameter: 14mm
- Bore diameter: 8mm +0.02/-0.0
- Mass: 12.4g