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My Air Compressor

PostPosted: Sun Sep 08, 2019 8:07 pm
by JoeF250
My air compressor is a 5 hp, 25 gallon. It is 120 or can be 240. It has a label on it that says 9.1 SCFM @ 40 PSI. Also 7.1 SCFM @ 90 PSI. It's a sears craftsman.
Can I use a spray gun with this compressor?

Re: My Air Compressor

PostPosted: Sun Sep 08, 2019 10:52 pm
by DarrelK
So this horse hasn't just been beaten to's been run over by a truck, set on fire, and hit with nukes. Seriously, use the Search thing on here and you quite quickly get the picture that we think a compressor with those kind of ratings is woefully underpowered for even the most efficient guns. Can you do panels with it?.....yes, spray with an lvlp kind of choked down, expect some water/moisture and you could get by. Use any kind of production HVLP or other gun and try to do an "overall" walking way. Before it probably burns up just continuously running it will be a "rainmaker" of biblical proportions. The gun won't even be making a proper continuous sized pattern and you'll say to yourself, " Gee, I can't spray for crap." So, start looking for a good used compressor. Something making at least 15 cfm at 90 psi would be a good start.

Re: My Air Compressor

PostPosted: Tue Sep 10, 2019 5:32 am
by JoeF250
Okay, I found this one for sale. This is his description:
Craftsman..oil free
60 gallon
6 hp
11.5 scfm @90psi

It's for $300. He said he used it to paint his truck and it did fine. Will this work and is this a good price for it?

Re: My Air Compressor

PostPosted: Tue Sep 10, 2019 9:23 am
Just beware of those "oil free" compressors.
Craftsman compressors are known for putting high horsepower
ratings on a smaller motor.
Craftsman once advertised a 3HP that was 110 volt, that's not even possible really.
Check the amps on the motor ID plate and see if it's in the
ball park with the advertised HP.
You can check online for how many amps a 6 HP motor should be able to draw.
When you start comparing motors that way you'll see some big differences.
Also, go listen to an oil free, they are loud.
The CFM at 90 should tell the story, compare that to the gun you'll use and you'll know.
Guns vary a lot.
But with 11 CFM, you should be OK for most guns, but not enough for most sanders.

Re: My Air Compressor

PostPosted: Tue Sep 10, 2019 11:07 am
by '68 Coronet R/T
JC is telling you straight.

There should be a tag on the compressor that lets you know everything important.

Mine is a 6 hp motor and it takes 240 volts and draws 30 Amps.
I have had this compressor for 10 years and use it almost everyday. Keep the oil changed and intake filter fresh and they last a long, long time.

Re: My Air Compressor

PostPosted: Tue Sep 10, 2019 10:03 pm
by JoeF250
How about this one, I'm thinking it can do sanding and painting right? This is at Tractor Supply. It's for $800

The Ingersoll Rand 5 HP Single-Stage Twin Cylinder Pro Air Compressor is designed to provide 100% continuous power. With its cast iron single stage pump, this heavy-duty compressor is built to last. Use this compressor to run your impacts, ratchets, grinders, grease guns or cutting tools.

5 HP, 230V twin cylinder air compressor
135 max. PSI with 60 gal. ASME tank
14.1 CFM @ 90 PSI, 16.1 CFM @ 40 PSI
100% continuous duty pump with cast iron construction
230V single phase motor designed for heavy-duty application
Extended design life lasts 8,000+ hrs
1 year industrial grade warranty on complete machine
2 year extended pump warranty with use of Ingersoll Rand's all season synthetic lubricant

Re: My Air Compressor

PostPosted: Wed Sep 11, 2019 9:14 am
For painting that should do, but no for some air tools like sanders.
But I don't even use my air sanders much anymore, the electric ones do just fine for me
so it's a choice.

Do remember though when comparing compressors, that 40 PSI rating, which always
has a higher CFM rating is a moot point, the compressor once filled will always be
refilling at a much higher PSI like 90 or above so the refill rate is more like the
90 PSI rating for CFM's when you need them.
And you don't want a borderline situation where the compressor runs most of the
time, it just creates a lot of heat which is a lot of water to deal with.

Re: My Air Compressor

PostPosted: Wed Sep 11, 2019 9:24 am
by '68 Coronet R/T
:goodpost: :goodpost:

If you plan to do more than one project please get the biggest compressor you can afford.
The difference between $800 and $1200 will seem like nothing compared to the peace of mind that your compressor can handle anything in a one man shop.

Re: My Air Compressor

PostPosted: Wed Sep 11, 2019 10:32 pm
by DarrelK
:goodpost: :goodpost: :goodpost: :goodpost: Man, ain't that the truth. I remember my wife giving me grief when we bought our first "big" shop compressor (7.5 two stage with 80 gallon tank) because it was like $200 more than the 5 h.p. 60 gallon at the time. When she saw me shopping on line the other day for one she said, "You should have bought two and just stashed one."

Re: My Air Compressor

PostPosted: Thu Sep 12, 2019 8:54 pm
by Doright
I have two hi time 60 gal tank 5 hp motor compressors with three cylinder single stage 18 cfm pumps for sale.

One is better than the other for some reason ? $300 each.
Here and see them run!

775 537 8457
Pahrump NV 60 miles north of las Vegas.