My Shizuoka turret mill has its original SEM brushed motors and a Centroid Acorn controller. To control the motors I have 3 of the cncdrive drives https://www.cncdrive.com/DG4S_16035.html. Works really well, cost effective and didn't require any messing with the mechanics.

My Bridgeport conversion has DMM servos and TBH there's not much between them, although the DMMs cost a fair bit, not forgetting the motors themselves.