Don Foreman wrote:
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.

Well said, Don. Every guy has different needs. A consumer-grade
compressor might suit you well. If you want a brand new compressor,
don't want to spend time tinkering with it, and don't mind a machine
which might need replacing in a few years, go for it. But if you like
tinkering, want a compressor which will last, and the air to drive your
43 CFM Ingersoll-Rand die grinder (they do make one, I'll find the model
number if you like) go for the ex-industrial unit.

Chris