Normal module mn = 2 mm

+ Pinion:

- Helix angle B1 = 30 deg., left hand

- Tooth number Z1 = 15

- Pitch circle dia. D1 = 34.64 mm

+ Wheels:

- Helix angle B2 = 30 deg., left hand

- Tooth number Z2 = 30

- Pitch circle dia. D2 = 69.28 mm Velocity ratio: i = Z2/Z1 = D2/D1 = 2

Angle between gear axles E = B1 + B2 = 60 deg.

The wheels axles are not parallel even if the wheels engage with the pinion at its opposite sides.