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Re: [Shop-talk] single vs. dual stage compressors

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Subject: Re: [Shop-talk] single vs. dual stage compressors
From: "Karl Vacek" <>
Date: Fri, 21 Nov 2008 11:34:19 -0600
You may have the solution to the controversy there.  Those Chinese guys are 
obviously using a 7:1 compression ratio at 90 PSI, a little low but pretty 
close.  They're saying that the tool really needs something like 28 CFM 
continuously - no argument there, if that's what it really needs.  Gotta 
say, though, I don't think anyof my old original Chicago Pneumatic stuff 
uses anything like that kind of air.  But it's OLD, from before that became 
Chinese Pneumatic.

Bottom line is that for most home shop uses even horrendous air usage is OK. 
Certainly a DA sander or air file or air drill will work fine, and you don't 
usually keep them going for hours straight.  You're always stopping to do 
this or that every few minutes anyway.

On your particular compressor and the professional spray gun...
A "real" 2-HP compressor will run a conventional spray gun continuously and 
may even shut off occasionally, depending on the atomizing air pressures 
used, air nozzle, etc.

Can we now change this into a Chinese tool-bashing thread ??   ;-)

> It's certainly possible that not all air tool makers rate their tools the
> same way, but I've had the same experience with all sorts of them, 
> including
> the professional grade paint gun that a (professional) friend of a friend
> tried to run with my compressor.  He refused to ever set foot in my garage
> again until I got a "real" compressor <G>
> Randall 
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