Dumb question time (again)...
I just bought a 3-jaw 4" chuck from Little Machine Shop for my mini-lathe. (LMS P/N 1941) Fresh out of the wrapper, but still in the goo, the chuck was very tight.
The chuck was stripped down, cleaned, deburred and stoned as needed, greased with a bit of lithium grease (Brownell's "Action Lube Plus P/N 083-050-002, Good Stuff!!) put back together and still as tight as my bosses wallet.
So I took it all apart again and looked around. Couldn't find anything. It seems that the scroll is the culprit. I put the bevel gears/key sockets back in and the stiffness was back.
I have an idea about putting in some lapping compound and, with the jaws removed, running the chuck for a bit with the key chucked up in a powerdrill. Comments, ideas?
Thanks for your help!