JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD 
III Year B.Tech. ME - I Sem      L  T/P/D  C 
                                               4   - / - /-  4 
(A50318) ENGINEERING METROLOGY

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UNIT - I:

Systems of Limits and Fits: Introduction, normal size, tolerance limits, deviations, allowance, fits and their types - unilateral and bilateral tolerance system, hole and shaft basis systems - interchangebility and selective assembly. Indian standard Institution system - International Standard system for plane and screwed work.

UNIT - II:

Linear Measurement: Length standard: line and end standard, slip gauges - calibration of slip gauges, Dial indicator, micrometers.

Measurement of Angles and Tapers: Different methods - Bevel protractor - angle slip gauges - spirit levels - single bar - Sine plate used to determine the tappers.

Limit Gauges: Taylor's principle - Design of GO and NO GO gauge, plug, ring, snap, taper, profile and position gauges.

UNIT - III:

Optical Measuring Instruments: Tool maker's microscope and its uses - collimators, optical projector - optical flats and their uses, interferometer.

Flat Surface Measurement: Measurement of flat surfaces - instruments used; straight edges, surface plates, optical flat and auto collimator.

UNIT - IV:

Surface Roughness Measurement: Difference between surface roughness and surface waviness - Numerical assessment of surface finish: CLA, R.M.S Values, R₂ Values, R₁₀ value - Methods of measurement of surface finish: profilograph, Talysurf - ISI symbol for indication of surface finish.

UNIT - V:

Measurement Through Comparators: Comparators: Mechanical, Electrical and Electronic Comparators, pneumatic comparators and their uses in mass production.

Screw Thread Measurement: Element of measurement - errors in screw threads - measurement of effective diameter, angle of thread and thread pitch, profile thread gauges.

Machine Tool Alignment Tests: Requirement of Machine Tool Alignment Tests, Alignment tests on lathe, milling, drilling machine tools, Preparation of acceptance charts.

Gear Measurement: Gear measuring instruments, Gear tooth profile measurement, Measurement of diameter, pitch pressure angle and tooth thickness.

Coordinate Measuring Machines: Types of CMM, Role of CMM, and Applications of CMM.

TEXT BOOKS:

1. Engineering Metrology / R. K. Jain / Khanna Publishers
2. Engineering Metrology / I C Gupta / Dhanpath Rai

REFERENCE BOOKS:

1. Dimensional Metrology / Connie Dotson / Thamson 4th Edition.
2. BIS Standards on Limits & Fits, Surface Finish, Machine Tool Alignment etc.
3. Fundamentals of Dimensional Metrology / Connie Dotson / Thamson / 4th Edition.
4. Engineering Metrology / Kenneth John Hume / Mc Donald.
5. Engineering Metrology / D. M Anthony / Pergamon Press.
6. Principles of Engineering Metrology / Rega Rajendra / Jaico Publications.