I've had one tremendously successful result first time I made a PCB with autoleveller. Used 0.1mm bit etching to 0.1 depth.
However, for some reason, I can not repeat that result anymore. Now whenever I try, i still get either a proper aircut somewhere, or the depth just is not enough. Most of the board seems ok, it's just there're some localized place(s) where depth of cutting just isn't sufficient.
I'm using a double sided tape to fix the board. Before I'd make sure that it's secured very well, now, however I grew careless
![Smile :)](./images/smilies/icon_e_smile.gif)
What concerns me though is that I tried to level out a piece of plastic using the "tin foil" method, however, after removing the foil - bit was air cutting all the way. E.g. didn't touch the surface at all. I got around it by jogging down to zero, and the slightly below it and reset DRO there. Kind of offset the zero. Then it was all well and levelled.
So my question is - are my problems most likely related to errors in the setup. Thickness of foil (And yes, it was smooth & flush with surface - used water under it), or kinks in the tape and so on?
Or is it possible my Mach3 setup is somehow stuffed somewhere? E.g. Is there an offset setting for Z or something like that?
Only other alternative to the above 2 would be a CNC controller problem, whereby it's missing steps in Z axis??? I doubt it's that though...