THC

HelloI have a plasma cutter runing on mesa 7i76e / thcad10 / linuxcnc 2.8.My Problem:As you can see on the attached picture (left cut) it starts really good but after about 100mm the THC starts to move up and down the Z Axis. The move distance of the Z Axis gets more and more up to 10mm at the end. Is there an another setting as in the Config Penel Arc - Height Per Volt? (currently set to 0.05mm)So I really don't know how to fix this and which settings could be responsible for this behaveHope that you know the reason for that and I would really appreciate a hint how to fix that.Thanks in advance for you replay.The settings:Config Panel THCDelay:1Threshold(V):1PID P GAIN(Speed):10VAD Threshold(%):90Void Sense Override(%):100PID I Gain: 0PID D Gain:0Run Panel THCAutoUse Auto Volts: (ticked)Velovity Anti Sive Enable (VAD): (ticked)Void Sense Enable: (ticked) 

Height Per Volt?
Leave at default 0.1 or whatever the default is, i never had to change that.
VAD at 65% or 70% should be fine, 90% is to much
THC delay i usually have at 0.1-0.2, only for slow cutting speeds use more if needed
And disable "use auto volts" until you get the machine working properly.
From your pictures, i would venture a guess at Z axis acceleration being way to low, or scaling being way off from reality.
If all of the above is set and verified to be OK, then set the P value to 8 or 7 or even lower, but if you end up any lower than 5, something is terribly wrong.

Hello Tommylight thanks for your quick reply. Need to check it out, let you know. BR

Hello Tommylight, yes this advices fixed my problem the THC is now working how it should.
Thanks once more and Happy new year!

You are welcomed, always.
Happy new year to all.