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An introduction to numerical control (nc) and computer numerical control (cnc) systems in manufacturing. It discusses the importance of work holding devices for maintaining accuracy and increasing production speed. The document also covers the basic components of an nc system, including the program of instructions, machine control unit, and machine tool.
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In order to maintain the accuracy of machining process it is quite necessary to hold the work piece as well as tool.
For rapid & high quantity productions these devices are necessary.
1)3 jaw chuck 2)4 jaw chuck
INTRODUCTION
Due to the increasing demand of production quantity & quality, manufacturers are moving towards new sophisticated equipment & machinery.
The need is to transfer instructions from man to the machine through automatic devices.
Manual operators are being replaced by automatic devices.docsity.com
INTRODUCTION
“NUMERICAL” means, expressing something by numbers.
“CONTROL” is exercise of directing & guiding power over something.
“NUMERICAL CONTROL” is directing power over something by using numbers.
Program
Machine Control Unit
Feed back
PROGRAM OF
INSTRUCTIONS
It is detailed set of directions which tells the machine tool what to do & in what sequence.
The program is fed to the machine control unit by some input media
e.g.
MACHINE TOOL
It performs the useful mechanical work.
It is simple machine tool ( lathe) that is integrated with control unit.
Computer Numerical Control (CNC) - A numerical control system in which the data handling, control sequences, and response to input is determined by an on-board computer system at the machine tool.