Not sure if this is a software issue with CC or CM (I suspect so with CC) but I will post it on the Shapeoko area since it is affecting depth of cut on my machine. Here’s the scenario:
I use my machine to cut a lot of precision parts for guitar making. In this case, I am trying to cut pick-guards with pockets to support electric guitar pickups and slots and other perimeter features to go around the neck joint and other electronics. The stock material is 0.1" thick. I set my depth of cut for the pockets, etc. to “use the bottom” of the stock, which is set to 0.1" in the stock set-up dimension area when I lay out my toolpaths. The problem is that when I set the toolpaths, generate the g-code, run the g-code in CM, the depth of cuts do not stop at 0.1". They always over-run the stock bottom by a large amount (not sure how much because I typically hit the pause button before the machine cuts deeply into my waste-board). I can overcome the issue by watching the job and hitting pause, but this makes me have to set up a separate toolpath for each pocket rather than running several similar pocket operations off of one set of codes. I also note that when I load the file into CM, that the Z toolpath extents looks way out of wack–like 45.somthing MMs on the z axis.
Now for the really crazy part. If I convert the stock dimensions to mm by selecting mms rather than inches in the setup section, the toolpaths run fine and stop at the bottom of the stock (in this case 2.54 mms). Again, this is a workaround, but all my SVG files are patterned on inches, so it makes for some conversion when I move everything into CC for creating toolpaths.
It seems to me that CC is having some difficulty dealing with very thin stock thickness. I do not have this issue when cutting into thicker stock (say .25"), and I am not sure why it seems to do fine if I convert the CC setup from inches to mm and run it. Any ideas?