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Posting your modifications would be helpful

It connects to the hardware stepgen index pin
probably something like:

hm2_7i96s.0.stepgen.00.index-enable

halcmd show pin hm2 | grep index
 (when linuxcnc is running)

should list it

Hello,
im struggling with the modification of qtdragon. I just replaced 2 buttons. Im able to use the new design and works almost everything well. The 2 new butttons are not working. I tried with the costum_postgui.hal but i got always an errror that this pin is not valid.So i checked in qtdragon via hallshow which pins are avalibel and i didnt found my button (action_air). i searched everywhere but i dont find anything like that. (Not even action_flood and that is working well)I wanted to search for the iocontroll but that is a executable file and i cant open it. (well, im not that familiar with linux).

I hope someone can help or give me some suggestions.

While the current and arc voltage can be controlled accurately during cutting,
you have large transients at arc start and stop (which happens in a fraction
of a nanosecond) V=L di/dt  is not your friend here...

RDA wrote:

The ”whole” idea is to stabileze the molten hafnium, tungsten or whatever the electrode material is.

Hafnium does not melt, it erodes.
Would not be much use molten, and to get it to melt, the surrounding copper electrode would have melted loooooong before hafnium.
-
PCW is trying to explain the induction phenomena that happens when applying voltage to a coil and then cutting it, the coil will induce current on it's own.
Find an electromagnet, apply some voltage to it and cut the voltage while watching the scope, it is amazing what voltages can be produced by it, way beyond what has been applied.