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The Machine Shop => Tools/Tips and Tricks => Topic started by: Punkur67 on November 21, 2014, 05:37:57 AM

Title: Air compressor
Post by: Punkur67 on November 21, 2014, 05:37:57 AM
Any recommendations for a 60gal air compressor under $750? I am looking at this Ingersoll rand right now.http://m.tractorsupply.com/en/store/ingersoll-randreg%3B-5-hp-air-compressor-60-gal (http://m.tractorsupply.com/en/store/ingersoll-randreg%3B-5-hp-air-compressor-60-gal)
Title: Re: Air compressor
Post by: fabr on November 21, 2014, 05:55:38 AM
Been too long since I had to buy one of that size for me to say. I've had my Dayton for approx 30 years though with only one repair,a reed plate, in all that time. It has never been turned off for 30 years approximately.It runs every day without fail.
Title: Re: Air compressor
Post by: Carlriddle on November 21, 2014, 06:46:12 AM
I bought an old one used with a 2 stage Kelloge pump.  It's rated for 150 psi.   Ended up buying a new motor for it even though one it had was just rebuilt. Don't think pump oil had ever been changed, took two hrs for it to burp out. It's outside and quite as a mouse. I run hard lines inside for drops. Usually leave on all time too.

I stole it for $100!!   
Title: Re: Air compressor
Post by: fabr on November 21, 2014, 06:50:35 AM
$100 + a new motor. Killer deal!
Title: Re: Air compressor
Post by: fastcorvairs on November 21, 2014, 07:14:37 AM
Most likely last you a life time with proper maintenance and will give you a solid base for future up grades.  Will run a half inch impact but don't expect it to run any air grinders for any length of time.  Docto's and such take twice that amount of air.  They will run for just a short time then lose power.  Later when the pump gives up go to Granger and get a good hi volume pump and put on it.  Something  around 35 or 40 cfms at 90 psi. A good hi volume pump will only reach 120 psi but will supply that psi at a consent out put.  I built most of my compressors using five horse power motors and Granger hi volume pumps.  Still going today and will out perform my new 7.5 screw.  Ran all my CNC mill's with sometimes three or four Docto's going at the same time. 
Title: Re: Air compressor
Post by: Punkur67 on November 22, 2014, 10:27:27 AM
I was going to buy a craftsman one but they have terrible reviews and also looked at the husky ones that have ok reviews.
Title: Re: Air compressor
Post by: dsrace on November 23, 2014, 09:12:27 AM
 i used an oil free craftsman 60 gal upright for about 10 years w/o issue until 1 day the piston let go and blew through the case and banked off of 2 walls and then flew back at us!
Title: Re: Air compressor
Post by: Punkur67 on November 23, 2014, 08:08:41 PM
I have had my craftsman 33gal oil-less for 6 years now  but I want more air and quieter than what I have.
Title: Re: Air compressor
Post by: Carlriddle on November 24, 2014, 05:42:41 AM
When I was looking to build mine yrs ago, found a place out in midwest I think, called Surplus Center.  They had some big volumn pumps for pretty cheap.  I bought some stuff from them, but freight it to high on heavy things.  But I did get the 5hp elec motor from them.
Title: Re: Air compressor
Post by: fabr on November 24, 2014, 06:57:18 AM
Don't be mislead by HP claims either. Quality motors will be  HP rated @ FLA(full load amps) 100% duty cycle. Cheap stuff will be HP rated @ motor burn out amps or less than 100% duty cycle. Some as low as 20% or so. BIG ,BIG difference.

 Check/compare the duty cycle of the compressor as well.
Title: Re: Air compressor
Post by: fabr on November 24, 2014, 07:05:25 AM
The IR unit you posted looks like a pretty good piece. They state 100% continous duty on pump and say "Running HP - 5 HP ". That SHOULD indicate FLA running. That would be good also.
Title: Re: Air compressor
Post by: dsrace on November 24, 2014, 03:40:39 PM
When I was looking to build mine yrs ago, found a place out in midwest I think, called Surplus Center.  They had some big volumn pumps for pretty cheap.  I bought some stuff from them, but freight it to high on heavy things.  But I did get the 5hp elec motor from them.

the surplus center is 4 miles west of where i work lol and they have an amazing supply!!
Title: Re: Air compressor
Post by: deano on November 24, 2014, 05:51:45 PM
you have all the good things in your back yard (ks)
Title: Re: Air compressor
Post by: Punkur67 on November 24, 2014, 10:57:10 PM
The craftsman is 3.1hp @ 75% duty and the husky is 3.2hp with no duty listed.
Title: Re: Air compressor
Post by: fabr on November 25, 2014, 06:24:35 AM
Craftsman electrical tools=Harbor Freight electrical tools.Same for Husky IMO.
Title: Re: Air compressor
Post by: Carlriddle on November 25, 2014, 11:57:21 AM
Craftsman electrical tools=Harbor Freight electrical tools.Same for Husky IMO.

Sweet, I got a 20% coupon at Harbor Freight if you want it.  ;D ;D
Title: Re: Air compressor
Post by: fabr on November 25, 2014, 02:20:38 PM
You can have mine.................... I was reading something a while back about HF. It seems that the owners knew they had to get a lot of stores built to sell their stuff but did not have the money to build all the stores their projections said they needed to succeed beyond the catalog/flyers business they had. All capital went into building those stores and they decided to sell the same junk as the flyers advertised with a no questions asked return policy until they had enough capital to begin selling better quality yet still less expensive items such as the floor jacks that are not bad at all-usually- or the tool boxes that are pretty good in their upper line. Many are as good or better than most Craftsman. Their mission is to eventually offer all their stuff of reasonably good quality for a very good price point. It seems to be working even if 98% of their stuff is still junk.
Title: Re: Air compressor
Post by: fastcorvairs on November 25, 2014, 03:09:25 PM
Nine times out of ten most people will not tack something back that is broken.  They will just chuck it in the trash and move on.  Unless it is a large item. 
Title: Re: Air compressor
Post by: fabr on November 25, 2014, 04:58:30 PM
HF has exploited that fact better than  any other.
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