Grinding the Jaws

[Floradawg]

@thehomeengineer ,
I had thought of that too, and it looks like there are 3 (?) bolts holding the backing plate to the chuck which would have allowed adjustment.
However, the chuck body "appears" to be running true..with no discernible run-out; if it did have, it would've been vibrating.
He should have checked that first.

I don't know why he thinks TIR of .002 is sufficient.

That's a metric indicator. Each division is 0.05MM. A very small amount.

[NeiljohnUK]

Grinding chucks is a Royal PITA, I have had to do two back to back 6 jaw glass lathe chucks several times at work, usually after someone's overheated the jaws or has had to change the jaw plates carried on the jaw bases (like soft jaws with replaceable sections). Being glass chucks the ways and chuck bodies are much lighter/thinner. so wear can be a big problem, then there's the length of the jaws...