wrote in message
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I'm facing the ends of some 303 SS TGP and wandering if having jaws
made from polturethane would grip the stock well enough.

Anyone try this??

I cover the jaws with electrical tape now so they don't stratch the
stock.

I did another job where I had to turn and thread the ends 1/2-13 with
a geometric type head, think they'd work for that? The tape trick
did.

I've seen Poly used for press brake dies, so.....

I'd suggest that if the cuts were light enough, you might get away with
plastic. Problem is it's ability to cold flow---which it might do under
enough pressure. Not the best of all worlds.

I get the idea you can mount soft jaws---otherwise you wouldn't be talking
about using plastic.

Any reason why you don't use either aluminum or steel? Properly
machined, they'll run, for all practical purposes, dead nuts (.0005"), and
won't mark your work. It is a good idea if the body diameter being gripped
be constant on all pieces. My policy is to hold that diameter to +/- .001"
maximum, to assure concentricity.

If you're not familiar with soft jaws, but are able to use them, speak up.
There's some information readily available for those that are not familiar.

Harold