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 26, Problem 16RQ
To determine
The three basic closed loop feedback A(4) schemes used on CNC machines.
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The worktable of a CNC machine tool is driven by a closed-loop positioning system that consists of a servomotor, ball screw, and optical encoder. The screw has 4 threads/in and is coupled directly to the motor shaft (gear ratio = 1:1). The optical encoder generates 180 pulses per motor revolution. The table is programmed to move a distance = 6.0 in at a feed rate = 25.0 in/min. (a) How many pulses are received by the control system to verify that the table has moved the programmed distance? Determine (b) the pulse rate and (c) motor speed that correspond to the specified feed rate.
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Give a real time example of an open loop system and explain with neatdiagram the operation of it. How will you convert the same system into aclosed loop system? Draw the diagram of the converted closed loop systemand explain its operation.(in an abbreviated and clear manner)
Chapter 26 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 26 - What human attribute is replaced by a CNC machine?Ch. 26 - Give an everyday example of a household device or...Ch. 26 - Explain how a toaster could be made a closed-loop...Ch. 26 - Prob. 4RQCh. 26 - Prob. 5RQCh. 26 - Prob. 6RQCh. 26 - What kind of operations on a milling machine...Ch. 26 - How is a machining center different from a milling...Ch. 26 - Prob. 9RQCh. 26 - Many manufacturers have purchased large machining...
Ch. 26 - Why was it necessary for machine tool builders to...Ch. 26 - Prob. 12RQCh. 26 - Prob. 13RQCh. 26 - Some of the functions performed by the operator in...Ch. 26 - Prob. 15RQCh. 26 - Prob. 16RQCh. 26 - Prob. 17RQCh. 26 - Prob. 18RQCh. 26 - Prob. 19RQCh. 26 - Prob. 20RQCh. 26 - Prob. 21RQCh. 26 - What is an encoder?Ch. 26 - What does a post processor do?Ch. 26 - What is a peck-drilling subroutine for a CNC...Ch. 26 - What is pocket milling, and what kind of milling...Ch. 26 - How are touch probes used in CNC machines to...Ch. 26 - What are G words used for in CNC?Ch. 26 - What major structural changes are introduced into...Ch. 26 - What process steps are eliminated by the UHSMC in...Ch. 26 - Draw a large circle and imagine you are (the tool)...Ch. 26 - Prob. 1P
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