More accurately: would it be worth anything if it's not broken, worn out, or otherwise trashed, and how likely is it to have problems that won't show up immediately?
Nameplate says "Emerson". I'd be using it mostly for filling tires and painting model airplanes.
$50 is actually pushing the "play" budget a bit, it's just that I'm getting damn tired of rattle-can paint jobs. So $50 + a motor is a bit hard to swing, unless I can trade the 3-phase motor for a 2-phase, or unless there's a _cheap_ and reliable way to cobble it up with start caps and run at reduced HP.
I was looking at this, too, but without knowing where it's been it's hard to know:
I've picked up several compressor motors of that style that were not putting out much air until the head had been removed and the reed valves cleaned, didn't need any new parts and aren't real complicated, just be sure to reassemble correctly (hopefully some one else has been there already and mis-assembled it).
Just a tip - if you go to look at it, pick it up off the ground a little bit and kind of wobble it back and forth, if it seems half full of water that may give you a clue as to whether to get it, or a bargaining point if it feels like it's got water in it.
I've picked up several compressor motors of that style that were not putting out much air until the head had been removed and the reed valves cleaned, didn't need any new parts and aren't real complicated, just be sure to reassemble correctly (hopefully some one else has been there already and mis-assembled it).
Just a tip - if you go to look at it, pick it up off the ground a little bit and kind of wobble it back and forth, if it seems half full of water that may give you a clue as to whether to get it, or a bargaining point if it feels like it's got water in it.
It's a nice little wobble-piston oilless that should be plenty for a homeowner. You can get parts for it if you need to, the head is either Gast or Thomas or Speedaire. And check the tank for signs of huge rust or pinholes - you don't patch leaking and rusted-out pressure vessels, you replace them. (Or try to sell them off to someone else.)
Forget the big 10-HP 3-Ph unless you're planning to work on cars and need that much air - you would need at least a 7-1/2 HP single-phase motor and a sheave change to use it at a residence - or a rotary phase converter. Forget a static, they don't put out enough power.
And the third one looks Real Rough. Wouldn't even think about it unless it's hooked up and running.
And spend the price difference for earplugs. :-) Good belt driven compressors are *much* quieter in operation than the oil-free ones.
Unless you mean the really small ones designed to pug into the cigarette lighter socket (if you still have one) to refill tires on the road. And those take forever to move much air. Totally useless for painting. :-)
actually, if you put a 1/4 HP motor on it (with proper reduction) you would have a much better compressor than one of those buzzy little things - in fact a old "free' washing machine motor will run it just fine, just well below capacity - that will be a very efficient (thermodynamically) compressor
He needed 40 PSI. That would have done it all day, all night. Even if it required a jack-shaft to adjust for lower RPM at sufficient torque: http://209.85.48.9/2428/142/upload/p3275451.jpg
They are certainly noisy - Once I forgot to turn mine off at the power point, I'm sure the neighbors were impressed with it coming on at 3am when the air leaked down. Had to drag myself out of bed to shut if off.
I was thinking of the small ones for running airbrushes. Your'e right about the tyre compressors - all pressure and no volume.
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