First I need to credit MeticulousMaynard and his post “Prototype for New Z-Axis”,
I downloaded from the Fusion 360 cloud, and reduced the mesh as much as I could. Hopefully it is allowed to use in the simulator, if not, let me know and I will rework it, so as not to infringe on your drawing.
I realized the front of the sheet material should be the center of the coordinate system not the back. So the center of the sled is now at 0,0,0. The frame has been moved away by 1.5 inches, as that is the stated max thickness (still ignoring the backing ply thickness). I moved the optional piece of ply down by that much too. Might be useful as a backdrop to see your work easier, or if you delete the base.stl which consists of the frame, you can rename the ply base.stl and just use it as the frame to simplify the view. Also added a chuck, looks complete now.
New machine definition:
9mm ply:
Important if you are installing on Windows 7. I installed GrblGru on my Windows 7 work laptop to try and figure things out, turns out I was missing the area called Actual WorkPosition! I had to reinstall as administrator and then it appeared.
So for the new machine definition follow the procedure as above, but with chuck center set at Zt = 120.189.
After you accept the data, you go back to the first screen. With the chuck center set at 120.189, a bit length of 100, Actual WorkPosition should be changed to Z= -20.189, and then click origin. This will place the bit just touching your imaginary plywood workpiece at 0,0,0.
Had a screenshot here with the settings, but new users can only insert one image!
Taking a break, then I’ll post some more screenshots.
Edit: Taking a break, then I’ll post one more screenshot.