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Old 08-08-2003, 06:54 PM
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How big a compessor?

Ok..Ready to mig weld cab corners but first need to remove the old ones with a cutoff tool...I bought one but my trusty 1 hp sears compressor doesn't come close. I'm ready to buy but unsure how big a compressor I need...I need one big enough to use a cutoff tool and air grinder but also will paint with it. Although I'll paint the whole truck...it will be a fender at a time etc.

How many Scfm's do I need amd how large a torage tank?

Thanks,

Keith

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Old 08-08-2003, 09:44 PM
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Look for a compressor that is two cylinder piston type, belt driven and rated at least 2hp (not peak hp). Do not take a diaphram direct drive peak rated hp compressor, they suck and are too noisy imo.

Vince
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Old 08-08-2003, 10:00 PM
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check out this link, I am planning to buy one myself
http://www.dodge-charger.com/Charger...threadid=22315
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Old 08-09-2003, 06:36 AM
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What concerns me is air tools seem to need about a min of 4 cfms an 90# pressure...some hvlp paint guns need over 11 at 40 # pressure I don't think the compessors shown at that link can put that out. I'd love to find out I'm wrong thou...
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Old 08-09-2003, 07:41 AM
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if you get a single stage try and find the most cfm rating at 90psi at least a 60 gallon tank,5hp,if you can get a two stage 80 gallon tank you spend the bucks it'll be the last compressor you ever buy ( my opinion ) and a good name brand
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Old 08-09-2003, 08:12 AM
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I have a 5HP 40 gallon oiless campbell hausfeld. It works good for painting, but comes up short on the cutoff wheel. I would say it is as small as you could go and run a paint gun, but it does work. That said, I wish I had spent 100 dallars more and got a larger belt drive unit with larger tank.

Chris
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Old 08-09-2003, 01:26 PM
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there is no such thing as to big.As the tool box grows so does the need for a bigger compressor.I started with a 6.5 hp with a 60 gallon and now have a 10hp 3 stage snap-on.Buy one big enough the first time, it's an investment
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Old 08-10-2003, 08:55 AM
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I found the easiest way to get the right compressor (and for the right price) was to build my own. I went to a scrap yard here that is semis only, and i found an air system that had a 16cfm 2-stage westinghouse compressor head! I bought it for $40. I then visited the local scrap metal dealer and bought an old, expired 100 gallon propane tank, same angle iron, and some piping. So, with some time and welding, you can build yourself a very nice compressor for the right price (approx $200 with pressure cut off switch, filters, 4hp 220v motor, etc) compared to some $2000+ shop compressors that are just as good. Just a thought to think about, and its a fun project.
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Old 08-10-2003, 09:22 AM
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Thanks guys...I guess size does matter....lol Seems like 7-10 horse with 60 gallon tank is what I'm lookin at. Two stage...Will probably visit Sears or Home Depot. Money also matters.

Thanks much for the input.

Slick
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Old 08-11-2003, 07:22 PM
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Brad- I always admire someone with your ingenuity,my hat is off to you, BUT did you have that old tank hydrostatic tested? If not I would STRONGLY advise you(or anyone building his own compressor) to do so unless it is a tank designed for the purpose and in good condition. In my many years of welding in the mining industry I have seen two tanks rupture and it is almost unbelivable what they can do if it happens. One old 40 gallon tank burst at 175 psi and nearly took the cab off a dm 800 mack truck! The other blew a hole in a garage wall so big you could drive a car through it! I truly wish I had some pictures of that truck as it would surly make my point.
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