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yes the sound is similar to what you describe and is more of random burst

I use mode 0.
I connected the divided arc voltage to the thcad and now the machine moves when it cuts, but it also goes on and of very often. You can see it here:



Could it also be a grounding-problem as the part is very small and I attached the ground clamp to the aluminium box where a steel grid is inside.

And why does it dive down in the middle of the part ? It seems to stop when the float switch is activated. 

I have found the problem to the error
It should be like this:
N44 G90
M99
not like this:
N44 G90 M99
It does not like to be on the same line

Can you describe the jitter, I suppose you hear clicks or gravel noise from the servos?
Is it always like a steady stream of those noises or are the bursts every few minutes?
Please elaborate.