Quote Originally Posted by JAZZCNC View Post
Ok well you might be screwed then regards proper slaving, you could always just connect both drives to one motor output, it's not the correct way but will get you working. The downside is you can't home each side independent to square the gantry without getting creative.
That was the whole reason for setting this system up. The machine was already working fine using GRBL, USB and no problems from the plasma. The only problem I had was that the gantry was so wide that it didn't stay square, so that is why i wanted to have Y and A slaved together for homing. I know that GRBL 1.1h also has slave options, but wanted a change from using UGCS.

I do have another board that has a parallel port, I might give that a try, maybe it has the same problem?