if you do as keith suggests, be sure to run some oil through the pump every
few days, AC pumps depend on oil in the working fluid, and there is none in
the air. Also, be sure to add a filter
"Ken Moon" wrote in message
ink.net...

"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
==================

If you're a fairly handy "do it yourself" type, you can build a good
system
for little cash outlay. Find a wrecking yard that has some 60's and 70's
cars left. Find one that has a 2 cyclinder air conditioner "V" style
compressor (York). These are a preferred style since they can be easily
set
up vertically and be stable. Take the clutch assy apart, and use epoxy to
fill it, or braze it to make it a solid assembly. Use a metal bracket to
mount it, using a 1/4 HP or larger electric motor to turn it. Unless you
will be turning something very porous, you will need a bleeder valve to
reduce pressure. Too much vacuum will implode a platter or large bowl.
Rotary vacuum couplers are available thru the usual wood turning
suppliers.
Cover the faceplate with a closed cell foam rubber (like a wet suit). A
vacuum gauge placed between compressor and lathe is a "nice to have "
accessory that allows you to monitor your system. An in-line air filter
will
assure a clean running compressor.

Ken Moon
Webberville, TX