Re: sizing and choosing closed loop motors.
From someone who does, or at least did this for a living, I have always used servo's, just because I preferred the closed loop feature and superior positioning, but that does not mean steppers do not have a place.
They have allowed alot to get into the DIY CNC game easier and cheaper that going with, and learning Servo's.
In my career, I only came across one commercial CNC machine that used steppers, albeit did it to the customers satisfaction.
You pay's your money and takes your choice !
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.