On 2017-03-26, Jim Wilkins wrote:

[ ... ]

It was a small fraction of my excuse to buy this 6-jaw chuck:
http://littlemachineshop.com/product...2276&category=

Yesterday I tapped broom threads
https://www.amazon.com/Grizzly-G1869.../dp/B0000DD0T7
in 1/2" plastic electrical conduit to make a tool that fits on a
painting extension pole. Neither a 3-jaw nor that 6-jaw would grip
well enough to resist the tapping torque and I had to use a 27/32"
collet. My main excuse to buy the 6-jaw was to chuck tubing larger
than 5C collet size.

That chuck has a gap in its gripping range. It doesn't open much
beyond 1" before the jaws slip off the scroll and the minimum ID it
will fit is 1.310"

No reversed jaws? Ideally, two-piece jaws so you can reverse
the top jaws while keeping the scroll engaged.

O.K. A 4" chuck, and they explicitly say the outside jaws are
not included -- but I see them as nice to have for some tubing sizes
anyway.

My usual chuck is a 6-1/4" Bison with two-piece jaws. I do have
a 6" 6-jaw, and I also don't have the outside jaws, and *want* them. :-)

The tapped hole was too small to screw on by hand until I
heat-softened the PVC. Threads in oak fit better so the plastic must
have deformed.

Stretched during the tapping, and shrunk back a bit afterwards.

Enjoy,
DoN.

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