Method for Specifying the Geometry of Spur and Helical Gears
AGMA 913-A98 (Reaffirmed May 2021)
AGMA 913-A98 (Reaffirmed May 2021)

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.

[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of AGMA 913-A98, Method for Specifying the Geometry of Spur and Helical Gears.]

This information sheet is intended to provide sufficient information to allow its users to be able to translate tooth thickness specifications which are expressed in terms of tooth thickness, center distance or diameter into profile shift coefficients, as that term is used in international standards.

This AGMA information sheet and related publications are based on typical or average data, conditions or application.

AGMA 913-A98 was approved by the AGMA membership on March 13, 1998.

Suggestions for improvement of this standard will be welcome.  They should be sent to the American Gear Manufacturers Association, 1001 N. Fairfax Street, Suite 500, Alexandria, Virginia  22314.

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