In the international gear business, the ISO 6336 rating standard is gaining more acceptance across many industries and markets. This is important to U.S. gear manufacturers as it can affect not only the ratings coexisting designs that form the basis for a company's standard line of units, but can also dictate the basic design philosophy of sizing a new gear design. Using an AGMA-developed software package to compare the ratings for gears by the ISO and AGMA methods shows how the AGMA and ISO standards differ as various parameters are changed. The gear parameters studied include profile shift/addendum modification coefficient changes, helix angle changes and pressure angle changes. Since this comparison is for rating trends instead of actual ratings, they were normalized for each rating method. The article indicates how each rating standard could alter the design for the same gearbox.
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