This part of ANSI/AGMA 2015 establishes a system
of accuracy relevant to radial composite deviations
of individual cylindrical involute gears. It specifies
the appropriate definitions of gear tooth accuracy
terms, the structure of the gear accuracy system and
the allowable values of the above mentioned deviations.
The radial measurement accuracy system has
different grade ranges than the elemental ranges in
ANSI/AGMA 2015--1--A01. The diameter and module
ranges for radial composite deviations and
runout are also different.
The radial composite accuracy system comprises 9
accuracy grades for total or tooth--to--tooth radial
composite deviations of which grade C4 is the most
accurate and grade C12 is the least accurate. This
standard is for the ranges:
0.2 ≤ mn ≤ 5
2 mm≤ d ≤ 1000 mm
3 ≤ z ≤ 1000
β ≤ 45°
where
mn is normal module;
d is reference pitch diameter;
z is number of teeth;
β is helix angle.
See clause 7 for tolerances.
AnnexAprovides information onmaster gear design
and tolerances. Annex B provides information on
runout, including an equation for determining the
tolerance, for use if agreed upon between manufacturer
and purchaser.
There is no correlation between accuracy grades of
elemental measurements specified by ANSI/AGMA
2015--1--A01 and radial composite measurements.