Untrue 4 jaw chuck ?

[Clive HartlandParticipant @clivehartland94829]

I for one have never assumed that the 4 jaw chuck jaws are square, I always use the face of the chuck to set up using parallels and using the tailstock center to push/force the job onto the parallels. The center usually centers the job good enough for me. This at least gives me 2 faces equal/parallel to a certain degree.

Perhaps the technique of using a 4 jaw chuck needs to be assessed.

Clive

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