air compressor question - Team Camaro Tech
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post #1 of 5 (permalink) Old Jun 7th, 00, 02:31 PM Thread Starter
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Join Date: Apr 2000
Location: pa
Posts: 579
any body seen the new craftsman 2 stage compressor.it runs on 110v and
has a 20 gallon tank.they say it will contiuously run sanders and spray
guns.i am in the market for a compressor.iwas considering the craftsman 6.5
horse 60 gallon that is 220v.could this new compressor compare?i have not
used a 2 stage before so i don't know.also considering the devilbis pro air
6.5 horse 60 gallon ,or the husky(home depot) 6.5 horse 60 gallon.the 20
gallon tank seems pretty small to me.any body have any experience with
any of these? i need to run sanders grinders and be able to paint a whole
car without waiting for the compressor.also would like it to be QUIET(yeah
right)
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post #2 of 5 (permalink) Old Jun 7th, 00, 03:19 PM
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I don't think any 110v air compressor will do the job.
You should compare cfm at a certan pressure.
Here are some CFM numbers from a reference book:
Sander-7" 15cfm
Paint gun:
Std-5
Production-9
Die grinder-4
The book says these cfm numbers are based on 90psi use and assume 25% use. Meaning they are being used only 25% of the time. If you are going to sand 15minutes without stopping, I'd multiply these figures by 4. Better yet if you can find the cfm from your manuals use that.

I ran a body grinder and sander and painted my race car with a 2 horse Sears type. It was the type sold about mid 80's.
I had to wait a lot and it got so hot the hoses heated up. The moisture would condense in my air tools! I had to install a toilet paper type filter and add hose to the system to try and cool the air down and make it drop moisture. It was probably a 10 or 15 gallon tank. I'd have liked twice as much power and air.

The 6.5/60 sounds good. It would help if you can put it in an area where it will recieve air blowing on it to cool it when it is working hard. Or position a fan that can blow on it even when it cycles off it so it will cool down more.
A bigger tank is nice and will cool the air some. I think when you are really working hard, meaning continuesly, the tank size is of less benefit. It depends on how you go at it. If you stop now and then the bigger tank will store more air. That's when a two stage pump will allow more pressure to be stored in the tank.
If you are using air closer to the capacity of the compressor, you might be better off with a single stage compressor as it should have a higher CFM rating.
On two stage systems, one piston pumps into the second piston to get enough pressure, up to 150-175 lbs.
On a single stage, they are usually 125psi max but pump more air cfm for the horsepower.

Single stage is better at pumping volume, two stage is better at pumping pressure.
My trusty little Craftsman was a single stage, two cylinder two horsepower. Since replaced by a 10hp three phase compressor.

My old air rachet really humps now, on 150psi! The DA sander, I have to turn down.
David

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post #3 of 5 (permalink) Old Jun 8th, 00, 02:04 AM
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Location: Bardstown, Ky
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Chris - I just purchased a new one this year and if you are planning on doing any major work (painting, etc.) you should definitely go bigger. I picked up a 6hp, 60gal, single stage, cast iron pump, Campbell Haudfield Extreme Duty at Home Depot for $400.00. For the money, a hell of a compressor. I've seen people pay a lot more money and not really get much of a better unit. Unless you are a body shop and will use it 10 hours + a day, I think the Campbell Hausfields are the best all around value. JMO.
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post #4 of 5 (permalink) Old Jun 8th, 00, 03:28 AM
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Chris you deffinately wanna go with the larger compressor as I have a new 5 horsey 20 gal single and I tend to over work it often.


71 Camairo
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post #5 of 5 (permalink) Old Jun 13th, 00, 05:26 PM
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Exclamation

<BLOCKQUOTE>quote:</font><HR>Originally posted by ochrisl:
any body seen the new craftsman 2 stage compressor.it runs on 110v and
has a 20 gallon tank.they say it will contiuously run sanders and spray
guns.i am in the market for a compressor.iwas considering the craftsman 6.5
horse 60 gallon that is 220v.could this new compressor compare?i have not
used a 2 stage before so i don't know.also considering the devilbis pro air
6.5 horse 60 gallon ,or the husky(home depot) 6.5 horse 60 gallon.the 20
gallon tank seems pretty small to me.any body have any experience with
any of these? i need to run sanders grinders and be able to paint a whole
car without waiting for the compressor.also would like it to be QUIET(yeah
right)
<HR></BLOCKQUOTE>

I agree with jm69ss have the same unit 2yrs old works great. if you check out super chevy may issue page 93 there is a shop air piping layout in there that is great! as rest of the article is.

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