scope:

This information sheet provides a general method for specifying profile shift and rack shift, with gear nomenclature and definitions. This document describes the effect that profile shift has on the geometry and performance of gears, but does not make specific design recommendations.

The equations in the first part of this document (clauses 3 and 4) apply to external gear pairs only. The corresponding equations for internal gear pairs are contained in clause 5.

Annexes A and B provide practical examples on the calculation of tool proportions and profile shift.