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During recent fair I was presented a problem in a roll forming machine. I suppose it makes threads by the modern way of roll forming rather than cutting. Machine have problems where gears repeatedly fail by cracking in the root btw. teeth and then deform and ending up tooth against tooth and total fail. Would there be another mechanism than gear being wrong or getting wrong in setup and "bottoming out"? If so why would they or machine OEM don't fix it? I hope to eventually get some data from this destruction process so something can be seen that support if that is the case or if it is just suddenly break down. Maybe it is the same as the pellets press, the thing is built in a way that it does not last longer than it does. 
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
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