DeGarmo's Materials and Processes in Manufacturing
DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 34, Problem 19RQ
To determine

The difference in feedforward and feedback.

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Explain what is meant by sequential control and illustrate your answer by an example.
(2) Described the advantages of feedback control. And what are the potential drawbacks of feedback?
- An end milling operation is carried out along a straight line path that is L=325 mm long. The cut is in a direction parallel to the x-axis on an NC machining center. Cutting speed = 30 m/min and chip load = 0.06 mm. The end milling cutter has two teeth and its diameter = 16 mm. The x-axis uses a DC servomotor connected directly to a leadscrew whose pitch = 6 mm/rev. The feedback sensing device is an optical encoder that emits 400 pulse/rev. Determine (a) feed rate and time to complete the cut along the path L, and (b) rotational speed of the motor and the pulse rate of the encoder at the feed rate indicated.
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