The gear sets used in this comparison are presented in Table 1, with changes between sets highlighted. All are alloy steel. Speeds range from 700 to 45,000 RPM. The resulting ratings range from 200 to over 18,000 HP. An even wider range of gears could have been analyzed, but that probably would not significantly change the general conclusions of this study. Note that the values and factors chosen are sufficient for the purposes of this study, but they were selected for simplicity; they do not represent actual gears in production and should not be used as a recommendation or guide for gear design.
Ratings are for 20 years of continuous operation, except ANSI/AGMA 6011-J14 specifies that ratings are for a minimum of 40,000 hours. Therefore, for comparison, ANSI/AGMA 6011 ratings are presented both for 40,000 hours and 175,200 hours (20 years). The ANSI/AGMA 6013 ratings are for 10,000 hours as stipulated. The rating results are presented even if the pinion speed or the pitch line velocity is too high or low for the standard to apply.