Turning has never been a good practice , best never to get to the point it needs turning . I have only turned a disk once ,warped after a few weeks use , never again . Use them for about 2, maybe 4 sets of pads and off they go . Not worth it , what's the charge for turning a rotor ? New rotor is beween 20 and 80 for the better grade ,Turn disks ? I never turn them , better just to change them if they are scored or whatever .
What ? Sorry,but thats silly.
Why throw away perfectly re-usable parts, and why throw money out the window ?
Give them a turn, throw on new pads, and your set.