I have a 97 hurco Hawk 5 with ultimax ii control. The machine runs 3 baldor dc servos rated at 40 in-lb holding torque with a max rpm up 4500. Drives are made from servo dynamics. I’m looking into upgrading all the electronics on this mill to possibly a centroid set up and I’m trying to decide on whether or not to change to ac servo and drives or keep the dc Motors and drives. The motors I have now which are the original could probably use being rebuilt which I have priced and is not exactly cheap. The drives are getting old and I have already had to replace one. Any affordable options out there? Does anybody have any experience with the 1.8kw ac servo and drives sold on ebay? Anyways suggestions and idea are welcome!