A ball screw coupled directly to a dc servo motor is used to drive
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A ball screw coupled directly to a dc servo motor is used to drive

A ball screw coupled directly to a dc servo motor is used to drive one of the table axes of a CNC milling machine. The screw has 4 threads/in. The optical encoder attached to the screw emits 180 pulses/rev of the screw.

(a) What is the control resolution of the system, expressed in linear travel distance of the table axis? If the motor rotates at 1000 rev/min, determine the

(b) frequency of the pulse train emitted by the optical encoder and

(c) travel speed of the table.

Hint
EngineeringA transducer frequently used to measure rotational motion is the optical encoder. It is made up of a shaft that is attached to a disc that is round and has one or more tracks with alternate transparent and opaque sections. On the opposing sides of each track, an optical sensor and light source are placed....

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