I recently found out that a friend of mine has had a Miller Spectrum
300 plasma cutter (25 amp) sitting in his basement for a few years -- he bought it to have an employee cut some holes in some small stainless steel boxes to mount electronic components for a job for his factory automation business. Unfortunately, the employee could not get good results cutting the stainless, so the plasma cutter has been sitting in his basement ever since. (He sent the boxes out to a place that used CNC laser cutting.)Needless to say, I tried to think of a tactful way of saying "I'LL TAKE IT!!!" but before I could think of one, he asked me if I could help him learn how to use it. Specifically, he wanted to bring it over to my house and leave it with me for a while so that I could figure out how to use it, and then show him. (Naturally, being a friend, I reluctantly agreed to take in this poor underused plasma cutter!)
Okay, now for the questions: I've not used a plasma cutter before, and can't wait to try -- but is there anything special I need to know before I do? For example, are there special precautions that I should take above and beyond what I do for stick welding (hood, leathers, watch out for flammables, etc.)? What do any of you usually cut over
-- do you have a special cutting rack, or do you put the steel across some sawhorses and start cutting? I know I need clean, dry air ... anything else?
A couple of other questions: This unit can be switched for 110v or
220v. (It can only output up to 20 amps on a 110v, 20 amp circuit.) It is wired with a standard 20-amp 110v plug. To change it over to 220v, should I change the plug, or is it possible just to put together an extension cord with the appropriate plug for my existing 220v welder on one end, and a socket to accept the existing plug from the plasma cutter on the other end? Hmm, that didn't come out very clearly -- I guess my question is whether the existing plug on the plasma cutter can handle 220v.Also, any thoughts about why my friend's employee had trouble getting good results on the stainless? The stainless he was cutting is around
18 gauge; my friend said that when he cut the holes, it left too much dross, and it was taking too long to clean it up. I've read enough here to know (or to think I know!) that dross can be caused either by going too fast, or by going too slow. Would stainless be more susceptible to this problem than mild steel?Many thanks for any answers!
Andy