MY Own Simple Note Chapter 1 : CNC

                      
                      Chapter 1 :INTRODUCTION TO 

              COMPUTER NUMERICAL CONTROL  ( CNC )

milling CNC machine

 NC with  CNC

       NC

•     Transfer NC program from host computer directly to machine controller

•      Defined as operation of machine tool by specificity coded instruction to machine control system

•      Require used of punched taped

CNC

•  have more programmable features

• used stand-alone unit in a networking

• easier to program by more than one method

• on the board computer keyboard

• tape reader/ electronic connector to transfer  a program to CNC machine

THE ADVANTAGES OF CNC

- easier to program

- easier to change a program

- Avoid human errors

- complex geometry is produced

- It have closer tolerances

- Easy storage of existing programs

ROM AND RAM

a) ROM ( READ ONLY MEMORY)

• Electronic chip can be asses by computer but no alter without special equipment
• The executive program can not be erased
• The executive program always active when machine on

b) RAM ( RANDOM ACCESS MEMORY)

• Can be alter by computer
• NC code written into RAM by keyboard or other outside sources
• Battery backup system is used
• The content of RAM is lost when controller is turned off

5 WAYS TO INPUT THE PROGRAM INTO CNC MACHINE:

1. MDI ( manual  data input )
2. punched tape ( older medium for storage )
3. Magnetic tape ( most common use is 1/4 -inch )
4. Fluppy diskette
5. USB/pendrive

APPLICATION IN INDUSTRY:

• Aerospace
• Defence
• Automotive
• Electronic
• Appliance
• Tooling industry