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Re: Shaft slop help?
Even if you have the tight tolerances, there will always be some movement with a slip fit. It sounds like you have a slip fit because you didn't mention any pressing. Even if you get a precision ground shaft, you'll still have a few thousandths of space in there that will cause some wobble.
This can be compensated by taking up all the space on the shaft and putting it into slight tension with a spring. If you do this, you'll use the face of your tubing to hold the shaft axis in line with the bearing axis (or more appropriately keep the shaft axis normal to the bearing face). That does a lot to prevent wear on the bearing and sprockets.
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