Please Help me before I find Hammer

[Steve-m]

That linked thread partially explains why I was asking what happens if you change the cutting speed.

It's all to do with how the trajectory (motion) planner calculates movement, and combines that with other non-movement commands.

Trying exact stop mode (not always ideal for plasma cutting, where you really want speed to maintained as much as possible), or a basic G04 pause might be enough to alter exactly where the M5 command actually gets executed.

Thanks I changes speed from 1000mm / min to 2000mm / min and "undercut" more than doubled to about 36mm may look into changing NVUM to maybe a KK01 I have and a UC100, seems nvum has issues