On Monday, September 8, 2014 3:32:03 AM UTC-4, Shed_Fiddler wrote:
Gents what is the best way to protect some 20mm / ~3/4" PVC rod in a 3

jaw chuck. I don't have any collets, just the 3 jaw chuck.


Best way would be soft jaws; bore the 20mm profile into them.
If it's not for production, though, that's a nuisance. Otherwise,
consider thick pads (1/8" rubber, or even cork).
Or, maybe just make a socket for the rod, slip-fit,
and drive the socket on a center.