CSVTU B.E. VII Semester Mechanical Engineering Numerical Control of Machine Tools Syllabus

CHHATTISGARH SWAMI VIVEKANAND TECHNICAL UNIVERSITY, BHILAI (C G)

Semester: B.E. VII Sem. Branch: Mechanical Engg.

Subject : Numerical Control of Machine Tools

Total Theory Periods: 50 Total Tutorial Period: 12

Total Marks in End Semester Exam: 80

Minimum number of class tests to be conducted: 2

UNIT – I

Introduction

Fundamentals of numerical control, advantages limitations of N.C systems -classification of N.C systems.

Computer Numerical Control

Nomenclature, types and features of CNC machine tools. . Machine control unit. Position control and its

significance. Engineering analysis of NC positioning systems. Open loop and closed loop systems. Precision in NC

positioning systems: control resolution, accuracy and repeatability. Actuators: servomotors, stepper motors,

transducers and feedback elements.

UNIT – II

Features of N.C. Machine tools

Design consideration of N.C machine tools – increasing productivity with N.C machines, tooling for CNC machine.

System Device

Feed back system-counting devices digital analog converters

Interpolations

DDA integrators, simple and symmetrical DD reference word CNC interpolators.

UNIT – III

Part Programming

Process planning and flow chart for part programming. systems, nomenclature and tool geometries. Tool

presetting &Modular Tooling. Selection of tools based on machining capacity, accuracy and surface finish. Elements

of programming for turning and milling. part programming. Preparatory codes G, Miscellaneous functions M.

Interpolation, Tool compensations, cycles for simplifying programming. Typical part programming

Control Loops for N C Systems

Introduction-control loops for point and counting systems.

UNIT – IV

Computerized Numerical Control

CNC concepts-advantage of CNC reference planes, sampled data techniques, microcomputers in CNC.

Adaptive Control Systems

Adaptive control with optimization, and constraints-variable gains AC systems.

UNIT – V

Modern CNC machines

CNC lathes. Turning centers. Machining centres. Automatic pallet changers. Automatic tool changers. Direct

numerical control and applications. CNC machine design features.

TEXT BOOKS

1. Automation, Production Systems and Computer Integrated Manufacturing – Mikell P. Groover – PHI, 2001.

2. CNC Programming – S.K. Sinha – Galgotia Publications 2003.

REFERENCE BOOKS

1.

HMT Mechatronics – Tata McGraw Hill

2.

numerical control of machine tool by urie and koren

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