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Re: Press Fit
0.873 inch is way too tight. 0.874 inch is still tight. 0.8748 is just right.
AndyMark shows bearing pocket dimensions in their plastic wheels 0.001 inch smaller than nominal bearing O.D. In those wheels the plastic gives a little when you press in the steel bearing. Aluminum will give also, but not as much.
Good practice for pressing bearings of this O.D. range into metal pockets is 0.001 mm to 0.010 mm smaller than nominal bearing O.D. -- that would be 0.00004 to 0.0004 inch. That tolerance is very difficult to control using the tools of most FRC teams.
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
Last edited by Richard Wallace : 14-12-2011 at 08:22.
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