I have had my powermax 45 for about a year now and it has been absolutely awesome until the other day I started cutting bad. The arc would stop cutting through the plate in spots, way more edge taper and a little bit rougher cut edge. I though I had a bad ground but it did this on 4 different pieces of plate from 3/16" through 3/8". I put a new nozzle and electrode in it thinking it was that and it still did the same thing. So next I changed my air filter but it was clean and dry. I have a refrigerated air dryer then a water separator then the final filter. It almost acts like I turned down the power knob but it is all the way up on 45. I ran through all the power and resistance checks in the service manual but everything checked out fine.
Ryan