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Old 06-20-2020, 08:02 AM   #14
rotorwrench
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Join Date: Jun 2010
Location: San Antonio, Texas
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Default Re: Ring/Pinion Question

It's basically all about contact. At least a set that has run a long time generally has even contact even though it's worn. The contact pattern will change a bit but backlash will have a noticeable increase. I've set up a lot more main rotor transmission gear sets for the helicopters than I have rear axles but they will all run OK if the bearings have enough preload and the contact pattern/backlash are within limits. I always set up used gears closer to max limits than minimum. As long as they are within the acceptable range, they will run OK.

If gears have uneven wear and backlash varies too much, the set should be replaced. To run stuff that should be replaced is counter productive. One person may be OK with it but they will likely pass it on to the next guy and they won't be happy when they find completely worn out gears with gear oil that looks like metallic paint.

Last edited by rotorwrench; 06-20-2020 at 08:09 AM.
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