Form diameter

Form diameter

Form diameter is the diameter of a circle at which the trochoid (fillet curve) produced by the tooling intersects, or joins, the involute or specified profile. Although these terms are not preferred, it is also known as the true involute form diameter (TIF), start of involute diameter (SOI), or when undercut exists, as the undercut diameter. This diameter cannot be less than the base circle diameter.1

Notes

1. "ANSI/AGMA 1012-G05", "Gear Nomenclature, Definition of Terms with Symbols".


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