1. CNC Machine Part Programming B-tech Mechanical 5th Semester Instructor: Engr. Qazi Shahzad Ali University Of Gujrat (UOG),Gujrat

2. Lecture Objectives At the end of the lecture, you will be able to:
Understand the meaning of important terminology connected with word address programming
Explain what comprise a program
Understand the meaning of a fixed or canned cycle
Identify the different codes of information required to program a fixed cycle
Describe the general sequence of operations to be followed in programming hole operations

3. Conventional vs. CNC machine
Machine Structure
The CNC machine tools are basically built in the same way as conventional machine tools. The difference lies in the fact that the machine components relevant for turning and milling processes are controlled by computers.

4. Conventional vs. CNC machine
Conventional machine
 eyes, hands, brain, skill
CNC machine
Program Control unit Motor Motion
No skill is required for operating CNC m/c

5. Advantages of CNC Flexible, high accuracy Short production time
Complex shapes
Short setting time
No skill requirement
Short inspection time/ high quality product
Low cost

6. Disadvantages of CNC High machine cost Complicated maintenance
Skill & training are required for programming and maintenance.
Parts are imported from aboard
High tooling cost
Temperature, humidity & dust must be controlled

7. Component and Function of CNC
Feed drive
Measuring system  Direct / Indirect
Work spindle  hydraulic
Cooling system  reduce heat
Tool turret

8. Coordinate System
3.1 CNC Axes

9. Axes on a CNC lathe

10. Axes on a CNC lathe

11. Axes on a CNC milling machine

12. Functions of a Few Common G-Codes

13. Common G-codes Used in CNC Programming

14. Functions of a Few Common M-Codes
M or miscellaneous codes are used to either turn ON or OFF different functions which control certain machine tool operations
M-codes are not grouped into categories, although several codes may control the same type of operations such as M03, M04, and M05 which control the machine tool spindle.

15. Common M-codes used in CNC programming

16. Thanks