Quote:
Originally Posted by Chris Percival
Hi Bill, not sure why you'd need repeatable centering, please elaborate?
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A normal 3-jaw chuck only centers a part to within a few thousandths.
(of course some are better and some do have adjustable centering)
Say you check a bar and turn it round. Remove it and put it back into the chuck. Chances are good if you put a dial indicator on it, it's not centered anymore.
It looks like the same situation exists with the hub holding fixture in your pictures. Once that fixture is removed from the chuck, it'll be hard to get it back in again centered precisely the same way.
Thus, not repeatable.
Bill