A paper entitled Gear Geometry, by Allan H. Candee, Mechanical Engineer, Gleason
Works, was presented at the Annual Meeting of the American Gear Manufacturers
Association in May, 1929. The paper was an extension of the author’s ideas presented in
ten blueprinted pages of diagrams, terms, and definitions to members of the AGMA
Nomenclature Committee in April, 1 928, under the title Universal Gear Geometry.
The paper of1 929 was reproduced in AMERICAN MACHINIST, July 4 and 11 , 1 929. Later,
in April, 1 936, it was adopted by AGMA as a Recommended Practice, and reprints were
distributed to members. At that time, the letter symbols for angles were revised to conform
to the standardization then under way in the Nomenclature Committee.
The 1 959 publication of AGMA 115.01 , Basic Gear Geometry, was essentially a reissue of
the 1 929 paper by Allan H. Candee. The original wording was found to conform without
need of change to the terms and definitions in AGMA 11 2.03, Gear Nomenclature. Only
minor editorial improvements were made, and a new term was introduced, profile angle,
which is explained in the definitions.
This information serves as an introduction to and explanation of the geometrical
relationships in gear teeth, but it does not in any way modify or affect standard gear
nomenclature which is the outcome of conscientious efforts by the AGMA Nomenclature
Committee which began more than seventy years ago.

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