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I have a Thermal Dynamics Pac 50. Was working fine. Now all of a sudden I got a tiny spark at the tip, but the spark gap is going crazy. Arcing like hell. Like everything is going back to the spark gap. What causes that??

Posted by Anonymous on


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  • 9 Answers

SOURCE: plazma cutter/no arc

The Cutmaster 50 used two different CD "Capacitor Discharge" Boards. The only ones I have seen a lot of issues with were the smaller ones that are 3.5" X 4"

I have worked on several of the them over the last few months. Even though you might see a spark at the spark gap on the board it might not be sufficient to create a pilot arc.

If your air pressure and so forth are correct your issue is most likely the two white capacitors on the CD board.

Posted on Nov 07, 2009


David Soto

  • 414 Answers

SOURCE: Thermal Dynamics Drag Gun Pac


Your plasma has a start arc pilot inside the machine, this one must be faulty, check your owner's manual and request the part to your nearest welding store. It is easy to replace.

Posted on Jun 26, 2011


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