Hello,
with wood my MPCNC works fine. Now I wanted to mill a custom pcb plate.
After some time the graver goes deeper and deeper into the pcb.
I can’t say for sure that Z-axis is “loosing steps” because it’s just graving (0,1mm deep), so there should be no z-movement.
@cybtrash I was thinking the same thing. The PCB plate my be flat and even, but your spoil board and your router may not in the same plane, causing this type of issue. Though you did say:
Guys I found the cause. I plugged the end mill power cable into a plug of another room (with an extension cord) and the problem is much, much less. I was able to carve the whole pcb. In the end it still lost some z-height but only about 0,15mm.
I mean the problem only appears with the copper plate. If I turn it around I can carve without problem on its back. Let’s think. Copper plate can conduct electric power. But it is not connected to anything.
Must be some kind of electric interference. I just don’t know how I can explain this. But my issue is reproducible.