Question: The worktable of an NC machine is driven by a closed-loop positioning system that consists of a servomotor, leadscrew, and optical encoder. The leadscrew pitch = 4 mm and is coupled directly to the motor shaft (gear ratio = 1:1).The optical encoder generates 225 pulses per motor revolution. The table has been programmed to move a distance of 200 mm at a feed rate = 450 mm/min.
(a) How many pulses are received by the control system to verify that the table has moved the programmed distance? What are
(b) the pulse rate and
(c) the motor speed that correspond to the specified feed rate?