Satellite internal screw drive
Normal module mn = 2 mm
+ Pinion:
- Helix angle B1 = 30 deg., left hand
- Tooth number Z1 = 15
+ Wheel:
- Helix angle B2 = 30 deg., right hand
- Tooth number Z2 = 30
Angle between gear axles E = B1 + B2 = 60 deg.
The blue curve is locus of a point on the satellite pinion (a space hypocycloid?)