"See this?" Elena pointed. "AGMA 20151A01 defines accuracy grades. If you specify a gear without telling the manufacturer which accuracy grade you need—A1 through A11—they might give you a low-grade gear with massive profile deviations. Those tiny bumps on the tooth surface cause the high-frequency whine and the shock loading that’s cracking your bearings."
host versions uploaded by users, which may allow for online reading or downloading depending on their subscription terms. Reference Info: You can view a free preview of the standard's scope and table of contents on the ANSI Webstore. specific tolerance table from this standard or comparing it to the older Q-grade system Agma 2015-1-A01 | PDF - Scribd agma 20151a01 pdf
Three weeks later, the new prototypes arrived. Marcus installed them in the test rig. He braced himself for the usual whine. "See this