STEPPER v/s SERVO

[sanjiv]

I am going to retrofit my Gorton vertical milling machine to CNC. Which motor I should select "Servo or stepper" cost will be a major criteria.

[mcpltd]

Stepper will be far cheaper, but you can achieve far better accuracy and speed with a servo system.

[NC Cams]

There is a FAQ section of the "Zone.

Go there and look for the "stepper versus servo" FAQ's. There is a LONG, very well detailed explanation regarding your inquiry.