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Re: Ball Bearings on PVC
608 bearings are 22mm (about 0.866 inch) outside diameter. They are among the worlds most commonly used bearings, as skateboarders everywhere will attest.
3/4 inch schedule 40 PVC pipe is about 0.804 inch inside diameter with about 0.113 inch wall thickness. So if you can bore the pipe ends out to suit the 608 bearing, you'll have about 0.08 inch wall thickness remaining. Should be strong enough assuming you aren't loading the pipe heavily or supporting a very long span.
[edit]A convenient feature of 608 bearings is their 8mm inside diameter. This makes them useful with metric M8 or unified 5/16 inch bolts as spindles. When used in small electric motors, 608 bearings can support either 8mm or 5/16 inch shaft extensions easily, because there is only 0.002 inch difference between those sizes.[/edit]
__________________
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 : 19-01-2009 at 21:22.
Reason: added shaft size
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