CNC Surface Grinder

What make and model do you have?

To convert you need to replace the hand wheels with steppers or servos. and instruct moves by getting the motor to move any distance , direction or speed.

You can use movement controllers like Galil or even software drivers like Mach 3,

If you can get hold of an old plotter (usually over-designed steppers) you can drive

the movement by simple HPGL or similar commands.