Profile angle

This definition is applicable to every type of gear for which a pitch surface can be defined.

Involute gears operate together correctly after a change of center distance, and gears designed for a different center distance can be generated correctly by standard tools.

The same involute gear may be used under conditions that change its operating pitch diameter and pressure angle.

Unless there is a good reason for doing otherwise, it is practical to consider that the pitch and the profile angle of a single gear correspond to the pitch and the profile angle of the hob or cutter used to generate its teeth.

In a spiral bevel gear, unless otherwise specified, profile angle means normal profile angle at the mean cone distance.