Quote:
Originally Posted by EricH
If your center-center is exact distance, most FRC folks will add 2-3 thou to that to account for manufacturing tolerances; if you make it 10 thou instead, you've really only added 7-8 to what is normally done.
Personally, I wouldn't attempt turning down a gear once it was cut, for the reasons listed above--there's too many things that could go wrong, minor enough it would seem, but just too many items to tempt Murphy and his gremlins. That goes for both a mill and a lathe, BTW. If someone really knew what they were doing, then that could work, but in FRC, those types of folks are rarer then we'd like to think, unfortunately.
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Is it really that common in FRC to add 2-3 thou? (I honestly don't know) For every gearbox I've designed I've only added half a thou and haven't had any problems with wear.
I do see the problems with the actually trimming the OD, depending on the team's machining expertise and capabilities it could be quite difficult to do. correctly