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Old February 21st, 2013, 12:52 PM   #1
CHEROKEEMUDMAN01
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air compressor/plasma cutter question

http://www.millerwelds.com/products/...p?model=M13811

i have been thinking about getting a plasma cutter for a while. seen this one and have a friend who has it and it worked well and seemed big enough for my needs. question is will my air compressor be enough? i have never understood how to tell how long you can use something b4 you have to stop and let air rebuild.
plasma says 5 SCFM (146 L/min) at 90 PSI MIN (621 KPa) 120 PSI MZX (828 kPa)

my compressor i have now is a 33 gallon 6hp that does 8.6 scfm at 40psi and 6.4 scfm at 90 psi. how long could i use the cutter b4 i would have to take a brake and let air rebuild.

if this compressor is to small the i will have to get a larger one b4 i spend the coin for the cutter just dont want to have a toy i cant use. thanks guys for any info.
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Old February 21st, 2013, 08:31 PM   #2
Tab
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If its a 6hp 33 gallon you will be fine. I ran a CNC plasma system with cuts that are far longer than you're going to be doing by hand on the same size system for a while because my big one was getting rebuilt.
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Old February 21st, 2013, 09:01 PM   #3
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I only had 1 220v circuit in my garage, so had to let the 60 gallon compressor build a tank, then switch the plug to use the plasma. I never really have a problem with it, just the tank full of compressed air without the compressor on never ran low....but I never used mine for cutting really large shapes out of plate, more like cutting brackets of axles, or cutting out smaller brackets, etc. I would think that compressor will be fine.
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Old February 21st, 2013, 09:35 PM   #4
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What tab said. My hand cuts are so short , you won't deplete the air faster than you the operator have to stop to reset your guides or cutting position. Roll with it.
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Old February 21st, 2013, 10:18 PM   #5
CHEROKEEMUDMAN01
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ok thank you guys just didnt want to buy it and be stuck with 6" cuts at a time.
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Old February 21st, 2013, 10:55 PM   #6
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Dude, having a plasma opens up a whole new world of fab. U won't be sorry.
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Old February 24th, 2013, 08:00 AM   #7
CHEROKEEMUDMAN01
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agree i go through about 20 cut off wheels a weekend doing fab stuff in garage. plus the mess and crap in the air they make it would be worth every penny
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Old February 24th, 2013, 09:31 AM   #8
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Quote:
Originally Posted by CHEROKEEMUDMAN01 View Post
agree i go through about 20 cut off wheels a weekend doing fab stuff in garage. plus the mess and crap in the air they make it would be worth every penny
You are using the wrong cutoff wheels. We build a large woodstove from 1/4 and started with a 4x8 sheet and started with a 6" .045" wheel and when I was done it was still larger than the 5" ones I usually use.
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Old February 24th, 2013, 10:01 AM   #9
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Buy the plasma. You won't be sorry. I have a 3/8" capacity unit and have made those cuts several times. I do 1/4" all the time, nice clean cuts once you get the hang of it.

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Old February 24th, 2013, 06:11 PM   #10
CHEROKEEMUDMAN01
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i use the 41/2 ones from lowes and home depot. do alot of floor pan repairs and it just chews through wheels and i can make them last not like my friend who if u give him the grinder its gone in 10 sec lol
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