Air compressor for shop

What amount of cubic feet do I need to run a shop couple impacts and a die grinder at the same time looking at ingresol rand 7.5 hp 24 cfm @ 175 psi .

That should be about right , you don't need that much pressure though , !25 is plenty of tank pressure and 100-110 at the tool is fine .

Back when I bought a big compressor I was all set to buy a 7.5 HP to have plenty of air for a couple of air tools at the same time and also to do some sandblasting. The Salesman actually talked me out of a 7.5 HP. He asked me how many times I would actually need that much air, said that 7.5 HP would use more electric and use it ALL the time and the starting amps is way up there. I ended up with a 5 HP Schrader/Bridgeport American made compressor with a 80 gallon tank and I hooked up a 30 gallon aux. into the line, have never run low on air. I think it puts out 18.? CFM. I have set the high pressure down to 150 and left the cut in at 90. Works good. If I leave the shop and forget to shut the breaker off and it starts when I'm at the kitchen table I can see the lights in the fixture over the table blink slightly. enough to remind me to run out and hit the breaker, and I have plenty of juice to it, glad it's not any bigger.

I just have a 3 HP. But is a big frame motor. Made in 1945. 80 gal tank. Never shut it off. Not hard to fix leaks. Set at 175 on at 125. Runs a 1 in. Impact to change semi tires. But I always let it shut off when tightening truck wheels. Vic

I have 20 cfm at 90 psi with an 80 gallon tank in my shop and it will run a da sander with air to spare. Plenty of air for painting projects and doing just about anything I'll ever do. You should be happy with 24 cfm.

Sounds a little funny 24cfm @175psi. 175 is too much pressure to be safe for all around use its hard on stuff valves ect. I would look some more they will run around 400 for good shop use.

cant think you would ever go wrong with Ingersol Rand, they were the only compressor that stood up to continuous duty in the tire shop.

That is plenty for a home shop. 24CFm at 175psi will run everything.

(quoted from post at 05:49:12 01/31/15) What amount of cubic feet do I need to run a shop couple impacts and a die grinder at the same time looking at ingresol rand 7.5 hp 24 cfm @ 175 psi .

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Ell of a compressor 24 @175... I would think 24@90/100... I have a 20@90 it be working on the low end all the time if I were running
multiple air tools like that.. I have a 27@100 that would keep up but I would be at the low end most of the time (low end 140)..
I do like 175psi if you can afford it 35 cfm would get'er done you will need 3 phase power for that one.. A die grinder loves air buy all you can afford... My compressors are set at 175 I would not have it any other way I want it to move when I hit it....

You never have too much CFM's. The die grinder will be used for longer periods of time and will be more likely to suck down the compressor than the impacts. An impact is more flow sensitive than pressure sensitive and is usually used in short bursts. The amount of CFM's a sand blaster uses depends on the size of the nozzle. A 18 CFM compressor will barely keep up with a 1/8" nozzle if you want to sandblast for long periods. For continuous use tank size doesn't mean much. A bigger tank allows you to use more CFM's before the compressor kicks in. After that you are relying on compressor capacity anyway. For short term large volume use like a 1" air wrench more tank capacity and a big hose is a plus. Just some random thoughts.

I have a 18 CFM 80 gallon compressor in the old shop that feeds a 3/4" air line that is buried to the truck shop. In the truck shop the air line ends at a 60 gallon holding tank. When my son is buzzing all of the rear wheels off a truck in one standing with the 1" air wrench the two tanks hooked together provides enough capacity to get the job done. If I am sand blasting with a nozzle that's worn big I have enough air for awhile longer because of the two tanks but after the tanks run down I have to quit and wait for a long time because it takes longer for the compressor to refill that big tank capacity.

My 5 HP cant keep up with blaster or die grinder, go for the 7.5 HP.

I have the compressor just like your thinking about getting ,works very good in my shop,i do body and painting run blast cabinet ect had mine 10 years no problems

Bigger is better. Someday you will own a sand blaster.

Like all, bigger is better. I have a 5hp 80 gallon Quincy. The crappy 1 ph Baldor motor lasted about 3 years with light use. It took $600+ to replace it with a Lessor.

I have the 7.5 HP model and like it fine. Took me about 4 air compressors to finally get one big enough. I bought mine from TSC scratch and dent then as an IR employee got another $ 250.00 rebate.