Evolution of CNC Technology, principles, features, advantages, applications, CNC and DNC concept, classification of CNC Machines– turning center, machining center-5 Axis and 6 Axis machining centre, types of control systems– -ATC-Turret Mechanism.
CNC Machine building, structural details, configuration and design, guide ways –Friction, Anti friction and other types of guide ways, elements used to convert the rotary motion to a linear motion–Screw and nut, recirculating ball screw.
Spindle drives–DC shunt motor, 3-phase AC induction motor, feed drives–stepper motor, servo principle, DC and AC servomotors, Open loop and closed loop control, Axis measuring system– synchro, synchro-resolver, gratings
Coordinate system, structure of a part program, G&M Codes, manual part programming, tool length compensation, cutter radius and tool nose radius compensation, indexing, subroutines, Canned cycle- Turning, grooving, thread cutting, Milling- Pocket cutting-drilling, APT Language
Economics of CNC, maintenance of CNC Factors influencing selection of CNC Machines – Cost of operation of CNC Machines –Practical aspects of introducing CNC machines in industries – Maintenance features of CNC Machines – Preventive Maintenance, other maintenance requirements
Reference Book:
1. HMT, "Mechatronics”, Tata McGraw-Hill Publishing Company Limited, New Delhi, 2005 2. Warren S. Seamers, “Computer Numeric Control”, Fourth Edition – Thomson Delmar, 2002. 3. James Madison, “CNC Machining Hand Book”, Industrial Press Inc., 1996 4. Ken Evans, John Polywka & Stanley Gabriel, “Programming of CNC Machines”, Second Edition – Industrial Press Inc, New York, 2002 5. Peter Schmid, “CNC Programming Hand book”, Industrial Press Inc., 2000
Text Book:
1. Yoreum Koren, “Computer Control of Manufacturing Systems”, Pitman, London, 1987 2. Mike Mattson, “CNC Programming Thomson Learning, 2003
