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Published byBrandon Harrington Modified over 6 years ago
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CNC Machine Part Programming B-tech Mechanical 5th Semester Instructor: Engr. Qazi Shahzad Ali University Of Gujrat (UOG),Gujrat
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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
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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.
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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
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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
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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
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Component and Function of CNC
Feed drive Measuring system Direct / Indirect Work spindle hydraulic Cooling system reduce heat Tool turret
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Coordinate System 3.1 CNC Axes
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Axes on a CNC lathe
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Axes on a CNC lathe
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Axes on a CNC milling machine
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Functions of a Few Common G-Codes
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Common G-codes Used in CNC Programming
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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.
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Common M-codes used in CNC programming
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