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Re: Omni Wheel
In that case you could try what Kevin suggested above.
Or, if you need more stability, you could mount a second bearing on the other side of the omniwheel.
The second bearing would go in a plate you would need to make or buy. The plate would need to be at least 2-1/8" in diameter and about 1/8" thick. It would need a 1-1/8" hole in the middle and a pattern of six clearance holes for 10-32 screws (about 0.2" diameter) on a 1.875" diameter circle. The plate would mount to the omniwheel using spacers, maybe 1/4" long, which would accept 10-32 screws.
The two bearings will both tend to fall out if you don't support them laterally on the inner races, so you'll need some kind of axle bushing on each side. But you'd need that anyway, to keep the omniwheel from sliding along the axle. I've seen axle bushings made from 1/2" inside diameter PVC or other kinds of pipe.
__________________
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)
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