"Lew Hartswick" wrote in message
m...
Joseph Gwinn wrote:
I'd like to get some soft jaws for the 3-jaw chuck on the Clausing 5914
lathe. This appears to be the chuck that came with the lathe. The jaws
are two-piece, and can be removed and installed the other way.

The chuck body is marked "BP71/6206", and is 8" in diameter. Apparently
these jaws are the "American standard tongue-and-groove" type. The
lengthwise groove is 0.31" wide, the crosswise tongue is 0.501 wide, and
the centers of the screw holes are 1.75" apart.

There seem to be a lot of people making chuck jaws, none of whichg I know
anything about.

What sources/makes are good, are bad, and why?

Thanks,

Joe Gwinn
I just made a set out of 6061 Al at school on Thur. Havent
used them yet but need them to hold some threads without
"buggering" them up. Havent figured out how to hold the
jaws in compression while threading all the way through
the soft jaws yet.
...lew...

In such a case, I like the jaws to project inward, beyond the surface of the
master jaw. Grip your spider (or piece of stock) on the master jaw,
allowing full access to the soft jaw. Works fine, Lew.

The isn't usually need to grip by the thread itself. You won't harm the
threads if you grip on the major diameter. Only problem with that is if
the thread is drunken, you may not achieve the alignment you hope for.
That's the beauty of soft jaws. If you machine them to conform to the
target diameter, they grip without damage.

Harold