I am very new with gears, but here is my problem:
I have been presented with the task of determining exactly when a pinion/gear set fail. I figured the best way to do this was measure the nominal backlash and backlash after the components have been used. I have come across a rule of thumb for backlash requirements:
min backlash = 0.03 / diametral pitch
avg backlash = 0.04 / diametral pitch
max backlash = 0.05 / diametral pitch
Do these equations hold true?
I have various spur, worm, rack and pinion, and bevel gears that were sent in for wear testing. The measurements were returned and the circular tooth thickness was measured at the pitch diameter. Is there a way I can approximate backlash with nominal and worn circular tooth thickness? I have looked through various PDFs online as well as the Machinery Handbook and have had a very hard time. Any helpful information that I could find mostly related to spur gears.
Overall, any information as to how to determine when gears "fail" (even if the machine using the gears is working) would be greatly appreciated. Thanks in advance!