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What do you mean not concentric? Details, its all in the details.Give us more info. What chuck are you using? 3jaw? What are you doing? Boring a hole or turning outside dia or both? Most 3jaw chucks have about .003" accuracy when
holding a round bar.If you remove the piece and place it back in the chuck the
outside dia could be out of round the .003" or whatever your chuck is unless you dial it in.Could you post a pic? regards.
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