4x daughter buffer cards,
I was looking for anyone that had experienced anything like this using the CNC board without GRBL. No computer to drive the co ordinates. Just joystick and end limits switches.
The CNC shields that I know of use stepper motors with stepper drivers, not servos.What are those?
There should be no problem controlling the stepper motors with your own program. These links may helpStepper Motor BasicsSimple Stepper Codealso look up the AccelStepper library...R