Constant problems

CrossFire ® PRO
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*strong textPreformatted textstrong textI’ve had nothing but problems with this machine… here are a couple:

  1. The torch keeps raising between each cut
  2. Obviously the torch is not shutting off between cuts and leaves a trail…
    is this common and just setting issues. Or something else?
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That happens when your plasma cutter is set on the 4t setting. It needs to be on 2t for CNC operation.

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OK…here we go…

  • First…@ds690 is right…look to see if you have the 2t4t setting corrected…
  • It looks like your lead in and lead out are set nicely…
  • is your material clamp on the actual material or clamped somewhere else…some of those cuts look like there is not proper “grounding”…make sure ytou have a clean spot to attach the clamp to…rusty metal is a bad contact for the clamp.
  • what are you plasma settings and what thickness of metal is that?..you could be going to fast for the thickness of metal. (amps…inches per minute)
  • what are your consumables like…can you show us a picture of the point and nozzel?
  • Lastly…do you have good pressure and volume…and dry air?
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thanks… it was set on 4t…someone changed it to hand cut a piece. Now, why does the torch keep rising after each cut until it loses connection…

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Copied from Langmuir’s explanation of 4t mode.

" In 4-Touch mode, the first touch of the trigger engages a low-amperage start, the second touch ramps up the cutter to the set amperage, the third touch ramps down the cutter to a low-amperage end, then the fourth touch disengages the torch. 4T mode is the preferred setting when cutting by hand for most people because it allows more control over the plasma arc without shutting the torch off. However, if a plasma cutter is set to 4T mode when used with a CNC machine, the CNC machine will still think that it is set to 2T mode. This will cause the CNC machine to use the cutter in low-amperage for the first cut, full-amperage when it is supposed to disengage and move to a new location, low-amperage again when doing the second cut, etc."

Given that explanation, the first cut loop would be at low power. The rapid to the next loop would have the torch at full power, but going at 300ipm. The next cut loop would be at low power again and the torch would shut off after that loop. The next loop would start that cycle over again.

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Watch your IHS light in Firecontrol, while it’s cutting. If the IHS switch is dirty or the connections are loose, it will report the IHS switch open whenever contact is lost. That will cause Firecontrol to raise the torch by .06" every time it happens, because it thinks the torch is dragging on the metal.

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It rises after a cut so it doesn’t hit anything while moving to the next cut. Your torch, in 2T mode, should turn off before it rises to move.

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Nice troubleshooting assistance here! I hope I dont need it, but you guys are great.

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thanks for the help guys

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well…I have been here 2 years…and we all need a little help now and then…it is a great place…and there are some serious old timers here…guys that are still on the OG tables…

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