Dick wrote:

I've got a Bison 6 jaw Set-Tru chuck on my lathe and it has got harder and
harder to open and close. I've sprayed in silicon lubricant and Dri-slide a
few times to try and lubricate it. I just decided to take it apart and clean
it. I've got the jaws out of it now and there was no swarf in there and very
little dirt. what I have found is the dry lubricant that I have sprayed into
it. I'm in the process of cleaning it now and was wondering if it supposed
to be lubricated and if so, what should it be lubricated with?


A thin film of very light oil. If you have some SAE 10 or 20 oil for
the lathe spindle, or other light oil around, that's what you want. You
generally wipe on the oil from a small rag that is lightly oiled, but not
quite saturated. When you get the chuck assembled, stand out of the way
when you first spin it up, as it will likely throw off some oil.

You want to wipe oil on all the sliding surfaces of the jaws and jaw slots,
the back and front of the scroll, pinions, etc. and the inside of the jaw
slots.

Jon