CHHATRAPATI SHIVAJI INSTITUTE OF TECHNOLOGY

Project on- COMPUTER NUMERIC CONTROL (C.N.C) MACHINE

Presented by-Aishwarya Dubey4th Sem, Mechanical

Guided by-Er.Rituraj Chandrakar

CONTENTS

• INTRODUCTION• HISTORY• WORKING• APPLICATIONS• ADVANTAGES AND DISADVANTAGES

INTRODUCTION

• Computer Numerical Control (CNC) is one in which the functions and motions of a machine tool are controlled by means of a prepared program containing coded alphanumeric data.

• CNC can control the motions of the workpiece or tool, the input parameters such as feed, depth of cut, speed, and the functions such as turning spindle on/off, turning coolant on/off.

HISTORY

• The first commercial NC machines were built in the 1950's, and ran from punched tape.

• In 1970 the first CNC machine is introduced with the advancement of following-a)Standard G-Code Language for Part Programsb)Computer Aided drawingc)Microcomputers

WORKING• CNC means Computer Numerical Control. This means a

computer converts the design produced by Computer Aided Design software (CAD), into numbers.

• The numbers can be considered to be the coordinates of a graph and they control the movement of the cutter. In this way the computer controls the cutting and shaping of the material.

•  G-code is a standardized programming language that many CNC machines understand.

• A CNC system consists of three basic components-1.Part program2.Machine Control Unit (M.C.U)3.Machine tool (lathe, drill press, milling machine etc)

APPLICATIONS• The applications of CNC include both for machine tool as well

as non-machine tool areas. Machine toll areas-Lathe

Drill pressMilling

GrindingLaser

Sheet metal press

Tube bending

Non-machine tools areas

WeldingCoordinate measuring machine Electronic assembly

Tape laying

ADVANTAGEHigh accuracy in manufacturing

Short production time

Increase in productivityGreater manufacturing

flexibilitySafety

Contour machining (2 to 5 -axis machining)

Reduced human error.Can be used

continuously 24 hours a dayLess supervision is

required

DISADVANTAGE

Expensive

High cost maintenance

Requirement of skilled part

programmer.

REFRENCES

• https://en.wikipedia.org/wiki/Numerical_control• http://www.technologystudent.com/cam/cncman4.htm• http://www.thomasnet.com/about/cnc-machining.html