Helical and shaft sense for helical teeth

1. FOR CROSSED SHAFTS

  • Sense: same sense (left or right) for the wheel and pinion.
  • Size: the helix angle of the pinion is the complement of that of the wheel.
  • Shaft rotation: the shaft rotation changes according to the angle of the teeth (see picture).

2. PARALLEL AXES

  • Sense: left for the pinion and right for the wheel or reverse.
  • Size: same size.
  • Shaft rotation: the shaft rotation is opposite.