"Don Foreman" wrote in message
...
On Fri, 14 Oct 2005 13:45:39 -0700, Grant Erwin
wrote:

RAM^3 wrote:

I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at
6.2
CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die
grinder.
Oh, it'll run it for a short period but not continuously and a sander is
out
of the question.

That's another issue - just as these consumer-grade air compressor vendors
overrate the CFM ratings for compressors, so they underrate the CFM on
their air
tools. I have yet to see an air die grinder which doesn't require a solid
15 CFM
at 90 psi to run the air pump at 50% duty cycle or below which is what you
should have to avoid wearing out your compressor.

Not 6 CFM. Not 10 CFM. FIFTEEN CFM.

GWE

Which sez your diegrinders need about 7.5 CFM. Diff'rent strokes for
diff'rnt folks. Weekend workers are not gonna be running a
diegrinder 16 hours per weekend most weekends. Sauce for goose 'n
gander, etc.

I don't know of any "weekend shop" guy that hasn't been satisfied
with his "consumer" 11CFM or so compressor.

I think we "advisors" should separate "whut I have" from "whut you
should have" when needs of askers may be different from ours.






I have a Porter Cable "7HP" 60 gallon compressor that keeps up with every
tool I have, die grinders, air drills, DA sander. Granted it will not run 24
hours a day powering the tool, but with my use the worst that happens is the
compressor runs constantly while the tool is in use. The pressure never
drops enough that I have to stop and take a break for the compressor to
catch up.
For the weekend warrior 10 CFM is just enough.
Greg