Thought I’d share my method for doing a cut-out toolpath and avoiding cutting into the tape and wasteboard.
I have a piece of tape on my wasteboard next to where I normally cut projects. When setting the Z height for a toolpath that will cut completely through my material or doing a rough cut-out that I want to be sure I’ve left a little more than an onion skin, I zero off the tape using a post-it. Then I use the thickness I programmed into my toolpath to raise the tool off the bed from there using the jog screen, then re-zero.
This lets me design a project without knowing the exact thickness of my material down to 100’s of inches. So, for example, I was designing a finger jointed box, I knew my material would be around 1/2" so I programmed my cut-out toolpath with 0.51 thickness. When I picked out my material, it was 0.48" (after planing a slight bow out of it). Before I run my toolpath, I zero off the tape, then use the jog in CM to raise the bit 12.95mm and re-zero… Shapeoko don’t care, it’ll happily cut air for a pass.