Today I’m working with a body blank that is bookmatched halves, and I’m running tests on MDF before I commit.
It seems that using the centre dot under ‘position’ in the ‘shape’ menu is not the way to do it. I thought if I positioned the bit on the middle of the centre line that it might carve outwards from there as a central home position, but it clearly wasn’t designed for that.
So I drew a 90 degree line down from my centre line at the end of the body end of the centreline, then another 90 degree line from that to establish my bottom left corner, and positioned the bit over the intersection. When I did an air carve though, it was off.
Here is a simplified version of the file I’m working on. Before anyone mentions, I know the neck pocket makes no sense- I’m just using the CNC to hog out material, I don’t trust it with my neck pockets, so I finish them offline.
So what mystical technique are you luthiers using to set up your carves to a centre line? I did set up G28 yesterday and scribed a centre line into my wasteboard, but when I entered G28 in my machine controls it crashed it. It was working fine yesterday… so I’m very confused.