"Wild_Bill" wrote in message
...
snip--

I think it mat have been Harold that commented that just about any 3-jaw
chuck would be suitable for using pie jaws with.. since the workholding
surfaces are cut in place, they're already concentric with and
perpendicular to, the spindle's centerline (even if the chuck itself had
previous accuracy problems).

That's correct! (Assuming the chuck has master jaws). The precision is
established by technique, it's not a function of the quality or condition of
the chuck. Even a lousy three jaw with sprung slides is capable of decent
work, assuming you follow "the rules" when preparing soft jaws. In the
hands of a fool, they can, and will, disappoint----but when applied
properly, they can be salvation when all other attempts fail.

Harold