So the place wih big toys has 120V 12-14" cutoff saw. Rather like this one:
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.
But what we need is a bench cutoff saw.....I wondered if they existed...
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.
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:
Acti Seen the ads for _This Old House Magazine_? Wondering where it will all end? Well, the fun's not over, pals and gals, 'cuz now we have NORM ABRAM ACTION FIGURES!
No reason for the tools to stop hummin' and the fun to stop comin' when they roll those closing credits! Now you and all your little "apprentices" can have hours of fun with your very own ActionNorm(TM)!
Basic ActionNorm(TM) Figure comes with flannel shirt, blue jeans, OSHA-approved MiniWorkBoots (TM), working tape measure, glasses, goofy grin, and detachable arms, hands, and fingers.
Think of the fun you and your kids can have patching up ol' Norm when he does a "boo-boo" on the table saw -- you can learn safe shop practice and microsurgery all at the same time!
ActionNorm(TM) PowahPak Tools include battery-powered Belt Sandah(TM), BisKitJoinah(TM) and AihStaplah(TM) among many others. These cost as much as the full-sized tools Norm uses on TV, and they wear out just as fast too!
ActionNorm(TM) WorkPak includes ToolBelt, plans for a miniature blanket chest, Lumbroid(TM) Action Building Material, folding edible Extend-O-Rule, made-to-scale 1" wire brads, and Tourn-O-Kit RepairPak for when Norm does a "boo-boo" on the table saw.
ActionNorm(TM) Endorse-o-Pak includes signed agreements with most major tool manufacturers, a toolbox full of real cash, and a Talking Mouthpiece(TM) lawyer figurine which utters 12 baffling but authoritative phrases!
BUT WAIT....THERE'S MORE!
Ever wonder whose Delta Norm's checkin' out when he's not in the shop? Well, she's here, she's from Revere, and her name's DoveTail Donna(TM)!
DoveTail Donna comes with Save The Rainforests T-Shirt, designer jeans, OSHA-approved patent leather WorkBooties(TM), and fully equipped DoveTail Donna(TM) ToolBelt (choice of earth tones or teal/purple/black). Optional accessories include chuck-key-lanyard hair band, emery boards (80, 150, 220, and 340 grit), and full line of Bartley's Gel System Cosmetics. Optional outfits include NurseDonna(TM) outfit with Tourn-o-Kit and Press-o-Bandages -- that's right, DoveTail Donna's a real RN, so that when ActionNorm does a "boo-boo" on the table saw, she's right there to help! Remember, kids, ActionNorm(TM) gets it done twice as fast when Donna's holding the other end of his workpiece!
AND IF YOU ACT NOW, WE'LL THROW IN A FREE BOOK!
Ever wonder why Norm's projects go together first time, every time? It's because he knows what every professional craftsman knows: those "swear words" are eally _secret mantras_ which can improve your projects and and make them look just like they were done by the pros! Now, in _Talk Like a Tradesman with Norm Abram_ YOU can learn to cuss just like real craftsmen do! Norm lets you in on the "trade secrets" that were "too much" for _This Old House_ and _New Yankee Workshop_:
-- "Sonofabitchin' bahstahd!" -- the way to drive big nails straight _every time_!
-- Get those joints tight, tight, tight with "mizzable cahksuckah"!
-- "the hahse ya rode in on" -- handling problem personalities at the Home Center and on the jobsite!
We'll throw this valuable book in FREE with your purchase of ActionNorm and DoveTail Donna -- or you can take it as your FREE GIFT for joining the Norm Abram Woodworkah's Book Club! Other titles include:
--"Make Things Which Have Geese On Them with DoveTail Donna"
--"Martha Stewart's Guide to Heavy Earthmoving Equipment"
--"Clip Your Own Poodle and Save A Bundle with Bob Vila".
Operators standing by....
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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