Effect of low-friction guideways and lead-screw flexibility on dynamics of high-speed machines

Rolling type as well as hydrostatic guideways generate very little damping in the direction of the feed motion. The ballscrew/nut flexibility driving a mass of a table, as a spring-mass system attached to the servodrive spoils both the transient response to the NC command and the response of the driven mass to the cutting force. The improvements obtainable by various measures including feedforward, accelerometric feedback and tuned damper are discussed.