In the early 1980s, authors from The Cincinnati Gear Company presented several technical papers comparing the gear
ratings from ISO and AGMA. These comparisons showed some interesting and diverse differences in the trends when
the gear geometry was changed slightly. These changes included addendum modification coefficients, helix angles, etc. .
There were also some interesting differences when the hardness and hardening methods were changed.
These earlier papers used computer programs developed at The Cincinnati Gear Company to make both the ISO and
AGMA ratings. Today, rating programs developed by an AGMA committee are available. The intent for this paper is
to use these programs.
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