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Re: Hex Turning - Runout Question
I'd say the problem is probably in your tooling as well. Do the same problems exist if, for example, you use the three jaw chuck on a round shaft and turn down the end of it to a smaller diameter? Is the total runout the same if you use a chuck versus your collet? Is your tailstock (if being used) aligned properly?
Also, just to be sure, where do you source your hex stock? Some suppliers might be better than others here. We've always had good success with the Vex stuff, but do keep in mind the Vex stuff is undersized slightly, so maybe that will affect how the collet grips on it if the collet is otherwise finicky? I'm not an expert on hex collets though.
I would avoid an independent 3 jaw chuck if you can, just because they are such a pain to get lined up and easy for students to misuse. I would make sure your 3-jaw is in good working order first, and if necessary make some adjustments as asid alluded to.
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