dave - 2 to 3 cfm is about right. More is better. See my article on vacuum
chucks/pumps either on my web (www.wbnoble.com) or in the tips section of
www.woodturners.org




"Dave W" wrote in message
...
From what I have been able to find, a vacuum of 10 inches should be
sufficient for a vacuum chuck.
What I can't seem to find is the minimum cfm needed.

Used pumps are fairly easy to find, but I'm not sure what is the minimum
size I need.

Dave in Cherrylog, GA