I was thinking of using an AC Servo motor to drive my spindle.The drive is a  Lichuan LCDB2  Drive takes
Input pulse instruction: differential drive/ open collector
Input mode: pulse+direction/Phase A and B orthogonal pulse
/PULSE 2
SIGN 3
/SIGN 1
PULSE 4
Have no Idea what is Plus+ and sig +

attached a part of the Manual for the wiring,
you can select the mode via paramater.