If you use a rotary table often it may be worthwhile to add a tenon on the base for a simple pre-trammed setup in the vise.
Making a couple of precision tenons & clamps to use with a grinding vise makes setting the setting of radius centre points easy.
Using the tool shank, a pin or even the spindle nose makes setting an endstop simple.
https://youtu.be/mDacjD0tKKw?si=Sr1b5BBjg6USxI-F
