air powered cutoff saws?

So the place wih big toys has 120V 12-14" cutoff saw. Rather like this one: <http://www.drillspot.com/products/62747/Milwaukee_6180-20_Abrasive_Cut_Off_Saw?s >
It's a PITA, it regularly trips the 20A breaker under heavy loads. {Why would anyone make a power-pig like that NOT 120/240???}
Got to wondering... how popular/available are air powered bench cutoff saws? That shop has a good air supply given our duty cycle.
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But what we need is a bench cutoff saw.....I wondered if they existed...
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On Tue, 13 Mar 2012 04:41:59 +0000 (UTC), David Lesher

One of our Neolithic Wreckers, O'deen, invented that years ago. I was looking for the work mutt article when I found this link. Please follow it from spokeshave's article on. I miss the old guys. <sniffle, sob, HONK> http://groups.google.com/groups/search?as_q=work+mutt choose <classic> Action Norm
And for those of you who forego the nostalgic, here's the start of that: --snip-- Since Floyd deciede to get nostalgic on us, I thought it was high time to repost this:
ActionNorm
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John Gunterman ..... http://www.shavings.net
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On Sun, 11 Mar 2012 05:00:55 +0000 (UTC), David Lesher

Sorry to dredge up the dead, but it has to be said - and wasn't...
IF that abrasive chop saw has a motor that is rated at 15A full load and is installed on a dedicated 20A circuit, and is tripping out a 20A breaker on a regular basis, that saw is trying to tell you something - BACK OFF THE FEED PRESSURE when the spindle RPM drops off - you are probably close to stalling the motor to get the breaker to trip.
You're going to release the "Magic Smoke" from the motor, then you have to throw it out and get another chop saw.
If this is being run by an employee who doesn't care if he burns up company property... Build an ammeter into a box mounted above the machine, and tell them to stop pressing down so hard when the needle hits the red line drawn at 15A. If it gets extreme, you might have to lock the breaker panels and make tripping the breaker an infraction for abuse of company equipment...
And if it isn't on a dedicated circuit, you need to get it on one - chopping the power off at full load and instantly stalling the spindle isn't good for the motor. It cuts the cooling air when it doesn't get a chance to coast down unloaded, and you'll burn up the motor.

Air power is very inefficient for a large stationary tool like that - conversion losses would override the burst power advantages.
IMHO the only way it would make sense is in an explosive atmosphere like a refinery where you don't want to make any more sparks than necessary. Or on handheld tools where a 2HP electric drill gets rather warm, and air tools tend to self-cool.
Or when the tool is mounted on a machine with an arm that rotates around the work, and a rotating air coupling is a lot easier to rig than electrical slip rings.
If you have a duty load like that, you need to switch to an electric drive Cold Saw. Go look on the right column of that drillspot page, they list one for a little under a grand.
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