Equivalent pitch radius is the radius of the pitch circle in a cross section of gear teeth in any plane other than a plane of rotation. It is properly the radius of curvature of the pitch surface in the given cross section. Examples of such sections are the transverse section of bevel gear teeth and the normal section of helical teeth.1
Notes
1. "ANSI/AGMA 1012-G05", "Gear Nomenclature, Definition of Terms with Symbols".
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