CMR331 CNC Machine Tools and Programming Syllabus:
CMR331 CNC Machine Tools and Programming Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
1. Explain the mechanics of metal cutting and the factors affecting machinability
2. Explain the working of basic and advanced turning machines.
3. Teach the basics of machine tools with reciprocating and rotating motions and abrasive finishing processes.
4. Explain the constructional features of CNC machine tools.
5. Explain the basics of CNC programming and the machine tools through planning, writing codesand ,setting up CNC machine tools
UNIT I MECHANICS OF METAL CUTTING
Mechanics of chip formation, forces in machining, types of chip, cutting tools – Single point cutting tool nomenclature, orthogonal and oblique metal cutting, thermal aspects, cutting tool materials, tool wear, tool life, surface finish, cutting fluids and Machinability.
UNIT II TURNING MACHINES
Centre lathe, constructional features, specification, operations – taper turning methods, thread cutting methods, special attachments, surface roughness in turning, machining time and power estimation. Special lathes – Capstan and turret lathes – tool layout – automatic lathes: semiautomatic – single spindle: Swiss type, automatic screw type – multi spindle
UNIT III RECIPROCATING MACHINE TOOLS
Reciprocating machine tools: shaper, planer, slotter: Types and operations- Hole making: Drilling, reaming, boring, tapping, type of milling operations-attachments- types of milling cutters– machining time calculation – Gear cutting, gear hobbing and gear shaping – gear finishing methods Abrasive processes: grinding wheel – specifications and selection, types of grinding process – cylindrical grinding, surface grinding, centreless grinding, internal grinding – micro finishing methods
UNIT IV CNC MACHINES
Computer Numerical Control (CNC) machine tools, constructional details, special features – Drives, Recirculating ball screws, tool changers; CNC Control systems – Open/closed, point-topoint/continuous – Turning and machining centers – Work holding methods in Turning and machining centers, Coolant systems, Safety features.
UNIT V PROGRAMMING OF CNC MACHINE TOOLS
Coordinates, axis and motion, Absolute vs Incremental, Interpolators, Polar coordinates, Program planning, G and M codes, Manual part programming for CNC machining centers and Turning centers – Fixed cycles, Loops and subroutines, Setting up a CNC machine for machining.
TOTAL: 45 PERIODS
COURSE OUTCOMES
Upon successful completion of the course, students should be able to:
CO1 Analyse the mechanics of metal cutting process and to identify the factors involved in improving machinability.
CO2 Understand the constructional features and working principles of basic and advanced turning machines.
CO3 Evaluate and select suitable machining operation to manufacture a given component.
CO4 Understand the constructional features and working principles of CNC machine tools.
CO5 Program CNC machine tools through planning, writing codes and setting up CNC machine tools to manufacture a given component.
TEXT BOOKS:
1. Kalpakjian. S, “Manufacturing Engineering and Technology”, Pearson Education 8th Edition, 2022.
2. Michael Fitzpatrick, “Machining and CNC Technology”, McGraw-Hill Education;4th edition, 2019.
REFERENCES:
1. Roy. A. Lindberg, “Processes and materials of manufacture”, Pearson India Education Services Pvt. Ltd, 4th edition, 2015.
2. Geofrey Boothroyd, “Fundamentals of Metal Machining and Machine Tools”, McGraw Hill, 1985.
3. Rao. P.N, “Manufacturing Technology Volume 2, Metal Cutting and Machine Tools”, McGrawHill, New Delhi, 3rd edition, 2013.
4. Peter Smid, “CNC Programming Handbook”, Industrial Press Inc., 3rd edition, 2007.
5. A. B. Chattopadhyay, “Machining and Machine Tools”, Wiley, 2nd edition, 2017.