My experience with the Acorn controller is I had Gary Campbell build me one that I was supposed to be able to use on my shopbot. He even said it was a turnkey replacement. After many hours of trying to get it to run I never got a file to run more then 30 seconds before it would freeze one of the steppers. I asked many times why I could move the gantry using the G0 command and never have the steppers act up I could put in a move like X96 Y48 and it would move to those positions at 600 inches a minute but if I drew a box and used the Vectric post make the file it would screw up within 30 inches. The fix that they wanted me to do was to spend another $1500 plus so that I could use the controller. I ended up rebuilding my old Shopbot controller and have not had any issues with it since. I think maybe the control card on the Acorn was faulty and could not process the file.