COURSE SUMMARY
Course Title: 
CNC Machines
Course Code: 
15MEC266
Year Taught: 
2015
2016
2017
2018
Type: 
Elective
Degree: 
Undergraduate (UG)
School: 
School of Engineering
Campus: 
Bengaluru
Chennai
Coimbatore
Amritapuri

'CNC Machines' is a course offered in the B. Tech. in Mechanical Engineering program at School of Engineering, Amrita Vishwa Vidyapeetham.

Unit 1

Introduction: Definition of automation, types of automation, Definition of NC, basic components of NC system, the NC procedure, NC Coordinate system, NC motion control systems, Interpolators – linear, circular and parabolic, applications of numerical control.

Features of CNC Machine Tools
Structure, Spindle design, spindle bearings, spindle drives, feed drives – DC servo motors, stepper motors and AC servo motors, actuation systems – recirculating ball screws and anti-friction guide ways, feed-back devices – optical rotary encoders and linear scales.

CNC Machining center developments, turning center developments, high speed CNC machine tools, automatic tool changers.

Manual Programming
Turning center programming: Axes system, ISO standards for coding, tool function, speed function, feed function, miscellaneous functions, rapid positioning, linear interpolation, circular interpolation, thread cutting, canned cycles

Unit 2

Machining center programming: axes system, tool function, speed function, feed function, miscellaneous functions, rapid positioning, linear interpolation, circular interpolation, tool length compensation, canned cycles for drilling, tapping and boring, cutter radius compensation.

Computer Aided Part Programming
APT language structure, Geometry statements, Motion statements, Post processor & auxiliary statements, MACROs, complete part programming in APT.

Unit 3

CNC Tooling
Turning tool geometry, modular tooling systems for turning, collet chucks, end mill adapters, morse taper adapters, boring heads and tapping heads, milling tooling systems, tool presetting, work holding devices - vices, grid plates, pneumatic and hydraulic clamps.

Assembly Techniques
Guide ways, ball screws and nut, feedback elements, spindle bearings.

Testing of CNC Machine Tools
Introduction, verification of technical specifications, functional aspects, verification during idle running, verification of machine tool accuracy and work piece accuracy, metal removal capability test, safety aspects.

  • Yoram Koren - ‘Computer Control of Manufacturing Systems’ - McGraw Hill Publishers - 2007
  • HMT Ltd. - ‘Mechatronics’ - Tata McGraw Hill Publishers - 2001
  • P. N. Rao - ‘CAD/CAM, Principles and Applications’ - Tata McGraw Hill Publishers - 2004
  • Mikell P. Groover and Emory W. Zimmers - ‘CAD/CAM’ - PHI Publishers - 2002