Put an indicator on the outside diameter of the chuck. I'd remove the chuck from its backing plate, clean up the mating faces, put it together and just "nip" the screws lightly. Put an indicator on the front face of the chuck and see what any error is and where it is. The chuck concentricity error seem to be consistent as regards amount and position of maximum concentricty. That is usually related to the tool, speed, feed etc. How do I troubleshoot and fix this?I doubt that the chuck is the sole - or any - cause of the poor finish. Its a threaded chuck and I can't see ny bur or damage tht would prevent it from tilting true. 005 out, with the high spot in the same place on the chuck. Put the inductor on it, and spun the chuck. Put the chuck back on and chucked up a center drill. I took the chuck off and indicted the spindle and it seems true. I finally got sick of the terrible finish I was getting and decided to investigate. Today I was turning an arbor to use to true a pulley. It seems like every time I find a problem with my lathe, I find another problem I have to fix before I fix the first problem.
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