Quote:
Originally Posted by Paul Copioli
Richard,
Remember that we increased the size of the hex in order to accommodate various larger hex stock. If used with the VEXpro shaft there could be as much as .001 gap between the flats of the hex shaft and flats of the bearing
The only true way to get runout indication is clamping the output and rotating the input.
We will perform this test on samples this Monday.
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Paul, you are right.
I did the TIR check just for my own curiousity. Actually, the VEXPro 1/2" hex shaft I used was quite a tight slip fit for the bearings -- needed firm hand pressure to get them on. If there were as much as 0.001" clearance I would have been able to feel that. Anyway, the TIR that I saw is consistent with "good" ABEC 1 bearings, in my experience.
Nonethless, you are right about clamping for true runout tests.
__________________
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)