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I have a Miller 375 plasma ,not the extreme version. My question, is there a rule of thumb as to the amt of air pressure and voltage to cut metal, or do you use the least amt. to do the job, to make the consumables last as long as possible?
Reply:the min. for the 375 is 4.5 cfm at 90 psi, the biggeryour comp over that the less time it will run to keepup with the cutter
Reply:I use double the stated minimum air flow as my minimum when choosing a compressor. At the stated minimum, you're waiting around more than cutting and the poor compressor runs forever. It won't last long with that kind of abuse. Small compressors like that are not made to run at 100% duty. Really, tripple the stated minimum is best, if you intend to really use the plasma cutter. My Powermax 380, which is the same as a Spectrum 375, runs best on 12cfm or more air flow. I dont use the plasma all that often, but when I do, it's because I have ALOT of cutting to do and I expect to get it done quick, which means alot of air demand. My 15cfm gas compressor is great for that. The 10cfm electric one in the shop is too weak for that kind of use.As for voltage, I run mine on max all the time, unless I'm cutting something thin and dont want to blow it into a mess.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:Thanks , from now on will keep the pressure cranked up. I just didn't know if the high pressure and voltage cut down on the consumables life / but they seem to last a long time as it is,I must be doing something right. You are right about the stated cubic ft.and pressure per. min. I got one from Northern Hydraulics Says 19 cu. ft. at 90 psi. thank god has 80 gallon tank, just take a break till it catches up.
Reply:some plasma cutters have a cut-off switch when pressure are too high my thermal dynamics cutmaster 50 specifies a pressure range... too high and it will not work.52, 59 & 66 Lincoln SA200, Tombstone Idealarc 250, Thermal Dynamics Cutmaster 50, Marquette 250 amp mig, Miller 330 A/BP
Reply:It is always best to use the pressure recommended by each individual torch manuafcturer. These pressures were developed by the process design engineers, and will provide the best combination of cut quality and consumable life.Low plasma torch pressure wears the inside of the nozzle orifice, high pressure wears the hafnium electrode emitter. Follow the pressure specs in the plasma system operators manual for best results!Jim Colt Hypertherm Originally Posted by GremlinI have a Miller 375 plasma ,not the extreme version. My question, is there a rule of thumb as to the amt of air pressure and voltage to cut metal, or do you use the least amt. to do the job, to make the consumables last as long as possible?
Reply:Jim is correct on the air pressure.If you are asking about the amp settings you have a range chart for your machine vs materials and material thickness. You don't do yourself any favors cutting 20 ga. at 40amps by hand.Some folks (metal art) will set to almost fault and cut slowly to have "dross" on the cut but it is hard on the machine and consumables.For best performance set it right and get a motorguard filter.Matt |
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发表于 2021-9-1 00:32:58