06ME32B/06ME42B - Mechanical Measurements And Metrology
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PART – A |
UNIT I |
Standards of measurement: Definition and Objectives of metrology,
Standards of length - International prototype meter, Imperial standard yard,
Wave length standard, subdivision of standards, line and end standard,
comparison, transfer from line standard to end standard, calibration of end
bars (Numerical), Slip gauges, Wringing phenomena, Indian Standards (M-
81, M-112), Numerical problems on building of slip gauges. |
UNIT II |
System of limits, Fits, Tolerances and gauging: Definition of tolerance,
Specification in assembly, Principle of inter changeability and selective
assembly limits of size, Indian standards, concept of limits of size and
tolerances, compound tolerances, accumulation of tolerances, definition of
fits, types of fits and their designation (IS 919 -1963), geometrical tolerance,
positional - tolerances, hole basis system, shaft basis of system, classification
of gauges, brief concept of design of gauges (Taylor's principles), Wear
allowance on gauges, Types of gauges -plain plug gauge, ring Gauge, snap
gauge, limit gauge and gauge materials.
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UNIT III |
Comparators and Angular measurement: Introduction to Comparator,
Characteristics, classification of comparators, mechanical comparators -
Johnson Mikrokator, Sigma Comparators, dial indicator, Optical
Comparators -principles, Zeiss ultra optimeter, Electric and Electronic
Comparators -principles, LVDT, Pneumatic Comparators, back pressure
gauges, Solex Comparators. Angular measurements, Bevel Protractor, Sine
Principle and. use of Sine bars, Sine center, use of angle gauges, (numericals
on building of angles) Clinometers.
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UNIT IV |
Interferometer and Screw thread gear measurement : Interferometer
Principle of interferometery, autocollimator. Optical flats. Terminology of
screw threads, measurement of major diameter, minor diameter pitch, angle
and effective diameter of screw threads by 2-wire and 3-wire methods, Best
size wire. Toolmakers microscope, gear terminology, use of gear tooth
Vernier caliper and gear tooth micrometer
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PART – B |
UNIT V |
Measurements and Measurement systems: Definition, Significance of
measurement, generalized measurement system, definitions and concept of
accuracy, precision, calibration, threshold, sensitivity, hystersis, repeatability,
linearity, loading effect, system response-times delay. Errors in
Measurements, Classification of Errors. Transducers, Transfer efficiency,
Primary and Secondary transducers, electrical, Mechanical, electronic
transducers, advantages of each type transducers.
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UNIT VI |
Intermediate modifying and terminating devices: Mechanical systems,
inherent problems, Electrical intermediate modifying devices, input circuitry,
ballast, ballast circuit, electronic amplifiers and telemetry. Terminating
devices, Mechanical, Cathode Ray Oscilloscope, Oscillographs, X-Y Plotters.
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UNIT VII |
Measurement of Force and Torque, pressure: Principle, analytical
balance, platform balance, proving ring, Torque measurement, Prony brake,
hydraulic dynamometer. Pressure Measurements, Principle, use of elastic
members, Bridgeman gauge, Mcloed gauge, Pirani Gauge.
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UNIT VIII |
Temperature and strain measurement: Resistance thermometers,
thermocouple, law of thermocouple, materials used for construction,
pyrometer, Optical Pyrometer. Strain Measurements, Strain gauge,
preparation and mounting of strain gauges, gauge factor, methods of strain
measurement
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REFERENCE |
TEXT BOOKS: |
1. “Mechanical measurements” by Beckwith Marangoni and Lienhard,
Pearson Education, 6th Ed., 2006
2. “Engineering Metrology” by R.K.Jain, Khanna Publishers, 1994.
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Reference Books |
1. “Engineering Metrology” by I.C.Gupta, Dhanpat Rai Publications,
Delhi
2. “Mechanical measurements” by R.K.Jain
3. “Industrial Instrumentation” Alsutko, Jerry. D.Faulk, Thompson Asia
Pvt. Ltd.2002
4. “Measurement Systems Applications and Design” by Ernest O,
Doblin, McGRAW Hill Book Co.
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