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250i help



g8trwood
03-07-2011, 08:49 PM
i have a new 250i and I am trying to cut some 1/4 plate, I had all kinds of fits, tons of slag and it took me forever to complete the cuts, I am in need of assistance. Can someone recommend what my amps and air pressure should be? I was ready to get a sledge hammer our earlier today...

Gadget
03-07-2011, 10:01 PM
I would use about 40 amps and 55 -65PSI. I've had that problem myself before and am embarrassed to admit I forgot to connect the ground lead. It was cutting using only the pilot wire to complete the circuit.

arandall
03-07-2011, 10:43 PM
I would use about 40 amps and 55 -65PSI. I've had that problem myself before and am embarrassed to admit I forgot to connect the ground lead. It was cutting using only the pilot wire to complete the circuit.

Glad you ponied up first Gadget - I've done the same thing.

Gadget
03-08-2011, 08:16 AM
Great minds think alike Art, or maybe it's fail to think. ;-)

g8trwood
03-08-2011, 08:34 AM
Not the ground this time, new plate and I even sanded a spot clean for the clamp. I had my air pressure up around 80, so I will cut it back some. I do have plenty of air that runs through two driers before getting to the machine.

Gadget
03-08-2011, 08:37 AM
80PSI seems a bit much for quarter inch plate.

SICFabrications
03-08-2011, 09:32 AM
also check to be sure that you have the leads hooked up on the right studs as well.... you cant run the plasma off the positive side of the machine

KHK
03-08-2011, 10:04 AM
Just a few questions. What type of metal are you cutting? If you fire the torch in mid-air what happens? When fireing the torch in the air, can you feel the torch move from the air pressure. Does your machine have a ARC Force knob? If so try setting it above 50% of the dial. ALL of the previous posts cover almost everything else.
Let us know what happens.

g8trwood
03-08-2011, 12:30 PM
So are you saying the leads would be opposite of stick welding? Meaning the torch is hooked to the ground side? My pilot arc is working normally if that helps

SICFabrications
03-08-2011, 12:40 PM
yes, for plasma, the torch will be hooked up on the negative side of the machine same with tig...

g8trwood
03-08-2011, 07:33 PM
Well I think too much air was my problem, it was blowing the slag sideways back into the cut and rewelding it. You cant hook up the leads wrong on the multi-function, torch and workpiece are always the same and you must change the polarity with the "cut, tig, stick" switch.

Thanks for the help.

Gadget
03-08-2011, 07:47 PM
Glad to know it's working now.