On 2011-09-10, Jim Stewart wrote:
Wes wrote:
Anyone have good pointers to where I can get a 6" scroll chuck with an adjustable back
plate? I know Buck makes one, I'm not sure what chuck we have on the LeBlond at work but
it is sweet being able to dial in concentricity. I'm trying to find the best deal on a
good chuck.

I need to get this accessory purchased soon. I just heard that the AG for Michigan may be
lifting the disability to own suppressors in my state soon which would divert my metal
working budget to my gun budget.

Don't mean to be a smart-ass, but could someone
tell me the advantage of a 3-jaw chuck that you
can dial in verses a 4-jaw independent chuck.

For a single workpiece -- none.

For multiple workpieces of the same diameter (e.g. production),
it repeats quite well (though not for workpieces of differing
diameters, where it is at the mercy of wear on the scroll and the
"interrupted threads" of the jaws.)

It seldom takes longer than 2-3 minutes for me
to dial in a 4-jaw chuck to .001".

And is about the same dialing in an Adjust-Tru style of chuck.
But you only have to do it once for a run of however many parts you want
to make in one setup.

I have a
dial indicator and base all set up and seldom
use a 3- jaw chuck any more. Am I missing
something?

Production work -- where time per part is more important than
set-up time.

Of course -- for enough parts, soft jaws bored to size can be
even better -- especially if you need a step against which to set the
part for depth control as well.

Enjoy,
DoN.

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