On 14 Apr 2005 18:05:39 -0400, DoN. Nichols wrote:
In article ,
Tom Miller wrote:

When you say "radial", I take it to mean that you want a piston compressor
with a number of cylinders radial to the crankshaft. The rest of the group
appear to think "centrifugal".

Not all of us. I was thinking of a radial graphite vane pump,
such as those made by Gast. However, I'm not at all sure that even
those could make the 45 PSI minimum which he wants.

I doubt it. We were using them (Cooper rather than Gast, but same design)
for an emergency backup vacuum/pressure system, and could get 5 inches of
mercury but not 10. An inch of mercury is almost exactly 1/2 PSI. They're
great for flow, but not for pressure.

A quick visit to their web page (they call them "rotary vane
pumps") shows the highest pressure available for any form of that is 25
PSI, so we can drop that idea. :-)

There ya go, agrees with what makes sense. Always nice when that happens.