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  #11  
Old 03-26-2018, 02:34 PM
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On the same site that you posted they have a sale on the rotary screw compressors. 100% duty cycle. Sure would be nice if you could afford it.
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  #12  
Old 03-26-2018, 03:59 PM
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Originally Posted by alchemist View Post
On the same site that you posted they have a sale on the rotary screw compressors. 100% duty cycle. Sure would be nice if you could afford it.
I am friends with two different machine shops both have over the years
upgraded to screw compressors. Very nice upgrades if you can afford them.
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  #13  
Old 03-26-2018, 04:01 PM
kbs2244 kbs2244 is offline
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I don't know about your area,
But the CL around here is full of compressors.
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  #14  
Old 03-26-2018, 05:02 PM
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Originally Posted by alchemist View Post
On the same site that you posted they have a sale on the rotary screw compressors. 100% duty cycle. Sure would be nice if you could afford it.
I built a township service garage and it was spec'd out with a machine room with a rotary compressor mounted on a slab inside, insulated for sound etc. (making full use of their tax dollars haha).
It looked like the best thing since sliced bread but it turned out that a compressor that big doesn't like only being used to blow up the occasional tire or run an impact once a week. They never ran it hard enough to get the oil hot and get the condensation out of it and it resulted in the compressor head seizing up before we even opened the building. They exchanged it for a reciprocating compressor and seem to be happy.
Maybe things have improved, but I wouldn't buy a rotary unless I planned to use it hard several days a week.
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  #15  
Old 03-26-2018, 08:27 PM
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I have a friend who only sells compressors and related items. http://www.ncaircompressors.com/industrial-series.html (I don't have any part of his operation). I called him this morning about this and he echoed what Matt just stated. Rotary compressors work better the harder they are used. He said they'd sold some to body shops but there were problems with oil in the lines. I have a 5hp compressor that has worked well for me for 18 yrs. I don't use it particularly hard but I've had good luck.

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  #16  
Old 03-26-2018, 10:05 PM
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Originally Posted by OleDog View Post
I have a friend who only sells compressors and related items. http://www.ncaircompressors.com/industrial-series.html (I don't have any part of his operation). I called him this morning about this and he echoed what Matt just stated. Rotary compressors work better the harder they are used. He said they'd sold some to body shops but there were problems with oil in the lines. I have a 5hp compressor that has worked well for me for 18 yrs. I don't use it particularly hard but I've had good luck.

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  #17  
Old 03-26-2018, 10:06 PM
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Funny thing I have owned 5 or 6 air compressors, the only one I paid for
was the engine driven one I bought new. All the rest were given to me.

I bought some parts along the way, so I really cannot complain.
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  #18  
Old 03-26-2018, 10:23 PM
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Originally Posted by alchemist View Post
On the same site that you posted they have a sale on the rotary screw compressors. 100% duty cycle. Sure would be nice if you could afford it.
Ya I’m not that big yet. Couple of shops I’ve been in have had them and they weren’t that big either, ended up costing more to short cycle a screw than just run dumb ol recip compressors.
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  #19  
Old 03-26-2018, 10:25 PM
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Originally Posted by platypus20 View Post
I’m surprised at that price point, that the Eaton, doesn’t have pressurized pump lubrication.

They also tout no aluminum crankcase, why not, they make car engines out of aluminum, on my compressor the crankcase is aluminum, with a cast iron cylinder liner.
At less than a 1,000 rpm I don’t know that pressure lube is a requirement but you make valid points on both.
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  #20  
Old 03-26-2018, 10:26 PM
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I have no complaints with my American made junk USG compressor
been using it for a few years painted numerous cars, tractors and other equipment had to replace the reed kit once dirt cheap fix....
its still going haven't had no oil or water issues but I do Have a fair Hankerson refrigerated drying system and separators.....
only issues I found in catching up has been with the sand blaster.....
only time it gets a brake is when I am sick an not working in the shop
other than that it see lots of use daily...
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