scope:

This part of ANSI/AGMA 2015 establishes a gear tooth classification system relevant to radial composite deviations of individual:

- cylindrical involute gears;

- sector gears;

- racks;

- cylindrical worms;

- worm gears;

- bevel gears, all types.

It specifies the appropriate definitions of gear tooth deviations, the structure of the gear tooth flank classification system and the allowable values of the above mentioned deviations.

The radial composite classification system is comprised of 11 tolerance classes for total and tooth-to-tooth radial composite deviations of which class R20 is the most accurate and class R30 is the least accurate.

NOTE: There is no correlation or interrelation between the classes specified in this standard and other standards such as ANSI/AGMA ISO 1328-1, ANSI/AGMA ISO 17485, ANSI/AGMA 2009, ANSI/AGMA 2011 and their predecessor standards. This standard uses a unique set of tolerance classes (i.e., R20 to R30) in order to further reinforce that no correlation to other elemental or radial composite standards exists.

The equations in this standard are applicable for reference diameters of up to 600 mm.

This standard provides equations to calculate tolerances for individual product gears when mated with a master gear. Tolerance tables are not included in this standard, however, tolerance curves for some classes are shown in Annex A for a module 1.0 mm spur gear to demonstrate the mathematical nature of the tolerance equations. An optional tolerance element for radial composite deviation over multiple, k, teeth is described in Annex B. Calculation examples to assist with interpretation and to verify calculation procedure are included in Annex C. The measurement of gearing mated in an assembly for a specific application is beyond the scope of this document.

NOTE: See AGMA 915-2 for measuring methods and practices.