Arc of approach is the arc of the pitch circle through which a tooth profile moves from its beginning of contact until the point of contact arrives at the pitch point, see figure Quantity must be a positive whole number. There is theoretically point contact between the teeth at any instant. The composite action test must be made on a variable center distance composite action test device, see figure This applies also in the case of wormgearing. This is done to avoid confusion in reading the symbols and to make a distinction between upper and lower case. Involute Base circle Involute teeth 4.
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It provides definitive meanings by the use of words and illustrations, for commonly used gearing terms. It included some symbols and abbreviations. This later became AGMA Most of these abbreviations were already listed in American Standard Z 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 Because of the widespread acceptance of the previous standards, changes were kept to a minimum.
AGMA In addition, terms which started to be commonly used in gear load rating were introduced in the annex. It was approved as an American National Standard on September 29, Suggestions for improvement of this standard will be welcome. At the time of publication, the editions were valid.
All publications are subject to revision, and the users of this standard are encouraged to investigate the possibility of applying the most recent editions of the publications listed. ISO , International gear notation - Symbols for geometrical data. ISBN: Pages:
1012-G05 Gear Nomenclature, Definition of Terms