JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-requisites

None

Course Objectives

The course content enables students to:

• Acquire the knowledge of Engineering metrology and its practice which is having increasing importance in industry.
• Specifically make the student to improve applications aspect in the measurements and control of process of manufacture
• Impart the fundamental aspects of the metal cutting principles and their application in studying the behavior of various machining processes.
• Train in knowing the fundamental parts of various machine tools and their kinematic schemes.
• Discuss various principles of jigs and fixtures which will be used to hold and guide the work pieces and cutting tools in various machine tools

Course Outcome

At the end of the course, the student would be able to

• Identify techniques to minimize the errors in measurement.
• Identify methods and devices for measurement of length, angle, gear & thread parameters, surface roughness and geometric features of parts.
• Understand working of lathe, shaper, planer, drilling, milling and grinding machines.
• Comprehend speed and feed mechanisms of machine tools.
• Estimate machining times for machining operations on machine tools

UNIT - I

Metal cutting: Introduction, elements of cutting process – Geometry of single point tools. Chip formation and types of chips. Engine lathe – Principle of working, types of lathe, specifications. Taper turning,– Lathe attachments. Capstan and Turret lathe – Single spindle and multi-spindle automatic lathes – tool layouts.

UNIT - II

Drilling and Boring Machines – Principles of working, specifications, types, operations performed; twist drill. Types of Boring machines and applications. Shaping, slotting and planing machines –Principles of working – machining time calculations.

UNIT - III

Milling machines – Principles of working – Types of milling machines – Geometry of milling cutters methods of indexing. Grinding – theory of grinding – classification of grinding machines. Types of abrasives, bonds. Selection of a grinding wheel. Lapping, honing and broaching machines, comparison and Constructional features, machining time calculations

UNIT - IV

Limits, fits and tolerances- Types of Fits - Unilateral and bilateral tolerance system, hole and shaft basis system. Interchangeability and selective assembly. Limit Gauges: Taylor’s principle, Design of GO and NO-GO gauges, Measurement of angles using Bevel protractor and Sine bar. Measurement of flatness using straight edges, surface plates, optical flat and auto collimator.

UNIT - V

Surface Roughness Measurement: Roughness, Waviness. CLA, RMS, Rz Values. Methods of measurement of surface finish, Talysurf. Screw thread measurement, Gear measurement; Machine

R18 B.TECH MECHANICAL ENGG. III YEAR

Tool Alignment Tests on lathe, milling and drilling machines. Coordinate Measuring Machines: Types and Applications of CMM.

TEXT BOOKS:

• 1. Machine Tool Practices/ Kibbe, Johne. Neely, T. White, Rolando O. Meyer/ Pearson
• 2. Engineering Metrology/ R.K. Jain/ Khanna Publishers.

REFERENCE BOOKS:

• 1. Principles of Machine Tools, Bhattacharyya A and Sen.G.C / New Central Book Agency.
• 2. Fundamentals of Dimensional Metrology / Connie Dotson / Thomson
• 3. Fundamentals of Metal Machining and Machine Tools / Geoffrey Boothroyd / McGraw Hill
• 4. Principles of Engineering Metrology/ Rega Rajendra/ Jaico Publishers.
• 5. Metrology and Measurement/ Bewoor & Kulkarni/ Tata Mc Graw Hill R18 B.TECH MECHANICAL ENGG. III YEAR