FOREWORD

In 1926 the AGMA adopted a recommended practice for gearing nomenclature, terms and definition"s.ic1t"included some symbols and abbreviations.

A complete revision elf terms and definitions by the AGMA Nomenclature Committee was AGMA 112.02 issued in October, 1948. This later became AGMA 112.03, and . American Standard B6.J0-1954, with ASME as a co-spoonsor.

A separate project dealing with Letter Symbols for Gear Engineering appeared in 1943 as AGMA 111.01, later becoming AGMA 111.03 and American Standard 86.5-1954.

Abbreviations for Gearing was another separate project released as AGMA 116.01 in 1955. Most of these abbreviations were already listed in American Standard Z32. 13-1950 ''Abbreviations for Use on Drawings", and it was, therefore, unnecessary to process gearing abbreviations as a separate American Standard. The number of abbreviations used in gearing has intentionally been kept very small to permit memorizing without the "need to refer to the standard.

AGMA Standard 112.04, "Gear Nomenclature-Terms, Defiriitions, Symbols and Abbreviations,'' was a· complete revision and integraiion of ihe thre.e standards previously mentioned. Because of the widespread acceptance of the pre.vious s_tandards, changes were.·, kept to a minimum. The standard in this form was approved by the AGMA Membership as of April 25, 1965.

This standard, AGMA 112.05, includes several revisions to keep it abreast with current gearing techniques. It has been approved by Standards Committee B6, Gears, the Co-Secretariats and the American National Standards Institute as of February 3, 1976, and designated ANSI B6.14-1976.