Posted by Chris Case [108.162.215.235] on Wednesday, July 13, 2016 at 12:53:31 :
In Reply to: O.T. How to enlarge a large hole slightly? posted by Sherman in Idaho [108.162.245.23] on Wednesday, July 13, 2016 at 11:59:54 :
Sounds like you are second guessing those Cat engineers whose talents you just waxed so eloquently about .
Bearings are precise, and haven't changed. I've never felt the need to mic a bearing seat if it wasn't galled up from a spun bearing.
Press the new one into the same hole the old one came out of, and get on with the job. If you don't think your BFH is big enough, heat the casting a bit. Freeze the bearing.
Rule of thumb I lernt is .001 + .001 per inch of diameter. So your bearing needs about 3 1/2 thou interference. Moderated by the engineers consideration, for things like different coefficients of expansion with temp. And if it's a tapered cup, it will compress harmlessly. They are adjustable cones, eh?
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