Hood,
Thanks for the explanation.
Double closed loop is the answer.
My intention is to add the scales to the table to give table feedback in addition to motor feedback.
I will be using 1 x 3.5KW Mitsubishi AC servo + Driver to drive the lathe spindle, then the rest 2 axis will be using Yaskawa AC servo.
Controller board = Kflop, was going to use SmoothStepper, but not sure whether it support feedback.
2 Heidenhain Linear scale.
Cast iron lathe bed, Lathe spindle head.
will show some picture later.