JNTUK- B.Tech 3-2 Sem METROLOGY Subject Material

JNTUK- B.Tech 3-2 Sem METROLOGY Subject Material

METROLOGY:

UNIT-1

SYSTEMS OF LIMITS AND FITS: Introduction, nominal size, tolerance, limits, deviations, fits and their types-unilateral and bilateral tolerance system, hole and shaft basis systems- interchangeability, determistic & statistical tolerancing selective assembly. British standard System, International standard system, application of limits and tolerances for correct functioning.

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UNIT-2

LINEAR MEASUREMENT: Length standards, end standards, slip gauges-calibration of the slip gauges, dial indicators, micrometers.

MEASUREMENT OF ANGLES AND TAPERS:

Different methods - bevel protractor, angle slip gauges-clinometer - angle

Slip gauges-clinometer-angle dekkor- spirit levels- sine bar- sine table, rollers and spheres used to determine tapers.

LIMITGAUGES:

Taylor’s principle - design of go and no go gauges; plug, ring, snap, gap taper, profile and position gauges.

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UNIT-3

OPTICAL MEASUREMENT INSTRUMENTS: Tools maker’s microscope and uses- collimators, optical projector, optical flats and their uses.

INTERFEROMETRY:

Interference of light, Michaleson’s interferometer, NPL flatness interferometer and NPL gauge interferometer.

FLATSURFACEMEASUREMENT:

Measurement of flat surfaces- instruments used- straight edges- surface plates-auto collimator.

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UNIT-4

SURFACE ROUGHNESS MEASUREMENT:

Differences between surface roughness and surface waviness -Numerical assessment of surface finish- CLA, Rt., R.M.S. Rz, R10 values. Method of measurement of surface finish Profilograph. Talysurf, ISI symbols for indication of surface finish.

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UNIT-5

Comparators: Types - mechanical, optical, electrical and electronic, pneumatic comparators and their uses.

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UNIT-6

GEAR MEASUREMENT: Nomenclature of gear tooth, tooth thickness measurement with gear tooth vernier & flange micro meter, pitch measurement, total composite error and tooth to tooth composite errors, rolling gear tester, involute profile checking.

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UNIT-7

SCREW THREAD MEASUREMENT: Elements of measurement - errors in screw threads- concept of virtual effective diameter, measurement of effective diameter, angle of thread and thread pitch, and profile thread gauges.

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UNIT-8

MACHINE TOOL ALIGNMENT TESTS: Machine tool alignment test on lathe, drilling and milling machines.

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