Originally Posted by
HimyKabibble
Pretty much any modern DC servo motor will be rated at 4000RPM or so, and will *require* reduction to make them usable. 3 or 4:1 is pretty common. If your existing motors are direct drive, then your path of least resistance will be steppers. There is absolutely nothing wrong with steppers, if they are properly sized, and properly driven. In machining performance, they will be every bit as good as servos. Worst case, you'll give up a little bit in rapid speed, which is really not all that important in most jobs.
1200 oz-in servos are overkill for a BP. I have 850 oz-in servos with 2.5:1 reduction and 4-pitch screws, and I can break tools all day long without losing position. And, it'll do 400 IPM rapids. With 1200 oz-in servos, you'll gain nothing in performance, and increase the chances of breaking the machine if something goes wrong. Bigger isn't always better.
Regards,
Ray L.