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Re: Gearboxes? Help!
In 2009 I experienced similar failures of AndyMark 12 tooth CIM pinions. Teeth rapidly wearing/sharpening, even with grease. Once it starts, there's no stopping it, since the tooth profile has been altered (and you've now introduced debris into the geartrain). Switched to Martin gears for the pinions that year and never had a problem with those. If I recall properly (it was a while ago), the AM gear measured 22 on the Rockwell C hardness scale while the Martin measured 28. I think those particular gears have since been changed in the AM product line.
This year we made our own plates and shafts, but used all AndyMark gears. Not a single problem.
In your case, I'm going with the posters above: lack of grease. I don't see any other plausible explanation.
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
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