Re: Air Compressors

Posted by DR. EVIL on May 05, 2018 at 11:54:55 from (174.197.9.82):

In Reply to: Air Compressors posted by farmallboy15 on May 04, 2018 at 18:16:58:

SON bought a 1964 Quincy 3 rated hp 2-stage compressor, 80 gallon tank, forget the brand of motor, ran but after shut-off you could hear air leaking in the unloader. Compressor was installed new at the Deck Truckstop along I-80, mile marker 19 Geneseo, Ill. About 1990 was sold to a small machine shop in Silvis, Illinois to supply compressed air to several machine tools, then about 2000 was sold to a body shop in Rock Island, Illinois where it worked until about 2011 when Son bought it for $500. He had to spend some money on the valves and unloader but it performs with ANY 5 hp 2 stage 80 gallon compressor, It has 100% duty cycle, best to let it run constantly, 24-7-for weeks at a time. There's a compressor service shop in Moline Illinois that can get him ANY part next day. Son's saving for a new 80 gallon tank for it to replace the 54 year old tank. It makes about 15-16 cfm @ 175 psi.

I bought a Porter-Cable 7-1/2 hp 2-stage 80 gallon compressor about 15 years ago. 26 cfm @ 165 psi. Runs my 40# HF sand blast pot continously, which compressor is only 50% duty cycle, I aim a shop fan at the motor and compressor when I blast. I wanted a 7-1/2 hp I-R T-30 from Home Depot but they wouldn't deal.

I've got two small Porter-Cable compressors, a 6 gallon pancake and a twin tank contractors compressor. They both run fine on 15A 110V household outlets, and either runs a nailer to do trim or framing nailing, air up tires. They are both oiless, noisey as all get out.

As a guy who suffered with small troublesome too small compressors for DECADES, before I got my big compressor, get a compressor 1-1/2 to 2 times the size you think you need. When I sand blast I really need a 10 hp. The orfice size determines air usage and they start wearing as soon as the sand hits them. Supposedly a 1/8th inch diameter hole flows 15 cfm @ 90-100 psi, everything a 5 hp 2-stage can provide, but it only stays 1/8th inch for a couple minutes. By the time the orfice wears to 3/16ths inch your air usage increases 225%, or about 34 cfm.

Yeah, I don't need 26 cfm of air often, but depending on what I'm doing in the shop the compressor may only run once a MONTH.

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