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Old 10-19-2005, 04:03 AM
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I have a single stage Cambell Haus. , cast iron cylinder [5hp. 60 Gal tank]. It will keep up with just about everything except my IR DA, those things are just air hungry, not that it won't do it, but it just about won't shut off. Maybe a more efficient DA out there then the model I have. Not that it won't keep up, but the comp will get plenty hot in the summer which seems to accelerate formation of condensation - good part is I seem to get good dry air by the time I trap the water. Painting is another story. No problems with using the HVLP guns I have - could be wrong, but I think it is rated right around 11 - 12 @ 90 PSI.

If had to do it again, I would go 2 Stage, but I got one heck of a deal on my single 2 years ago at Sears that I couldn't pass it up at the time. Got mine on clearance for $300.00.

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Old 10-19-2005, 05:45 AM
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I just bought a new compressor for the reason that I needed the air to
run my DA. It takes 15 cfm @ 90 PSI.
The good sanders typically take that much and you need a large compressor
to run them. Tank size has nothing to do with it, watch the cfm ratings
and compare. You usually get what you pay for in a compressor and I
personally think the Harbor Freight ones are very low quality.
Sears lies about their sizes, Their direct drive 5HP compressor has a
1HP 110 volt motor on it and it screams. I just got rid of mine.
Stay away from the oil-less (direct drive) ones, they're not as durable
and are very very loud.
This is one area where you want to get the best you can, it will last
a lifetime.

If you're running air tools you need a two stage.
A single stage will drop below the 90 psi needed before coming on to
pump back up, you'll run low on supply and it will work itself to death.
For just painting with a lower cfm gun they're perfectly fine,
that's all I had for years.
I'm on my 4th compressor now but I believe I got one to last.
It is about 17 cfm @ 90 and it just barely keeps up with my DA.
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Old 10-19-2005, 08:56 AM
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Anybody interested in a compressor should check this one out. I just bought one about ten days ago. It is a Kobalt K7580V2, item # 134749 sold at Lowe's. I think it is made by the same people that manufacture Bel Aire compressors. I found out that all Lowe's do not carry these. I couldn't even find it on their website. It is priced at $797.00 and I got an extra 10% discount for putting it on a Lowe's card. I think they are still currently having this same deal. Got to pay it off before the interest comes due.
It should be very good for a one person shop.

2-stage
80 gal. tank
7.5 hp motor (5 hp running)
22 amp motor
17.1 scfm @ 90 psi
15.2 scfm @ 175 psi
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Old 10-19-2005, 09:27 AM
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That's a lot of compressor for the money, big enough
to handle most anything.
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Old 10-19-2005, 11:03 AM
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Im sure this topic has been beat to death but my opinion is.... stay away from the CH power single stage compressors.

I have the tractor supply 60 gallon CH power extreme duty compressor

why stay away
1. pumps are junk. I bet my compressor had only cycled 30-40 times when the pump let go. If I remember right the compressor repair guy said its a reed valve pump and the reeds are held in place by cheap rivets. He told me that his company is going to stop dong warranty work on CH compressors because they do SO much of it that they cant keep up.

2. very much underrated.
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Old 10-19-2005, 12:00 PM
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That's a good point that should be considered.
Like I said before, you usually get what you pay for in compressors.
I paid a lot more for mine than a competitors brand that delivered
the same cfm, The quality difference was substantial.
There's a lot of very low quality units out there so buyer beware.
Always check CFM, the motor amperage (not horsepower)
and what you're really getting, they vary alot.
And make sure it's a brand that's reliable that you can get parts for.
Some of this stuff from China may not be available later on.
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Old 10-19-2005, 12:51 PM
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Kampr, That does look like a good deal for that much money because it looks like the specs are real and not a lot of inflated nonsense. 22 amps is a good bit of power and 17.1 SCFM@90 PSI is pretty good for an outfit in that price range. I think you did ok.

Campbell Hausfeld
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Old 10-19-2005, 02:58 PM
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There appears to be a lot of misunderstanding when it come to air compressors and air tools.

The only real advantage that 2 stage compressors have over single stage is air pressure. 2 stage compressors will typically allow pressures in the 175 to 200 psi range. Not only do very few applications call for these kind of pressures, but it takes more horsepower to get there. As to life expectancy, 2 stage compressors generate more heat. Think about it... You are compressing the air twice. Heat is a killer to compressor heads.

The only important factor is CFM (cubic feet per minute). You will find that most air tool manufacturers (except paint guns) don't even give you pressure requirements, only CFM. Ignore horsepower ratings, most of the hobbyist targeting compressor companies have been required to back down from the peak horsepower claims http://www.aircompressorsettlement.com/

Make your purchase decision based only on CFM. Also pay close attention to the rating on the air tools that you buy. Most manufacturers give you average air consumption. Ask for the consumption under load. Here is an example of a very popular 1/2" impact wrench. Ingersol Rand IR231 is rated at 300 foot pounds of torque. It's average air consumption is 4.2 cfm. Looks good, your Campbell 6.8 CFM compressor can do this. The drawback is the 300 ft-lbs is at 22 CFM. The load CFM on the DA will be around 17 (IR311A).

Always buy as many CFM as you can afford
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Old 10-19-2005, 05:41 PM
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Quote:
Originally Posted by oldred
Kampr, That does look like a good deal for that much money because it looks like the specs are real and not a lot of inflated nonsense. 22 amps is a good bit of power and 17.1 SCFM@90 PSI is pretty good for an outfit in that price range. I think you did ok.

Campbell Hausfeld
It did say that it was assembled in the USA. They may have made all of the parts somewhere else and shipped them in though. I don't know. I do like buying things made in the USA when I can to keep us all working.

Danny
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Old 10-19-2005, 06:33 PM
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Reasly, you are right about the CFM since that is what counts and if it is low not much else matters but you are completely wrong about 2 stage compressors. Two stage units are a LOT more efficient than single stage pumps allowing them to produce more CFM from a given amount of power and they run cooler not hotter. The real advantage of a two stage is CFM and in fact a two stage is Superior to a single stage in about every way, think of a single stage as a car with only one gear. Single stage units are only built because they are simple and cheap to produce thus allowing a low cost compressor that meets the needs for some who have no need for large amounts of air but the advantages of the two stage units are well known and there is just no comparison between the two.
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