I have a Haas programable 4th axis that uses a stepper motor to drive the head. The thing is ungodly slow. I would like to replace the stepper with one of the servos I have lying around but I want to be able to still use the original control box.
The control box has the stepper drive built in. Its a Unipolar 6 wire setup. So 4 transistors drive 2 center tapped coils in the motor. The servo drive I have has a couple different input modes. Step/dir, quadrature, and cw/ccw. So I can either take logic input that signal movement with one input for pulse and one for direction, standard quadrature like an encoder, and a mode where one input makes it move a set distance one way and another moves it the other.
And ideas how to convert the 4 phase output of the stepper drive to one of these other methods. I managed to take signals from two of the transistor drives to run the servo more in quadrature but the problem is my resolution is cut in half.