JNTUK R19 3-1 Mechanical Measurements & Metrology Material PDF Download


JNTUK R19 3-1 Mechanical Measurements & Metrology Material PDF Download

Students those who are studying JNTUK R19 Mechanical Branch, Can Download Unit wise R19 3-1 Mechanical Measurements & Metrology (MM&M) Material/Notes PDFs below.


JNTUK R19 3-1 Mechanical Measurements & Metrology Material PDF Download


  • Inspection of engineering parts with various precision instruments
  • Design of part, tolerances and fits
  • Principles of measuring instruments and gauges and their uses
  • Evaluation and inspection of surface roughness
  • Inspection of spur gear and thread elements
  • The methods of measurement of displacement, speed, acceleration, vibration, stress and strain, force, torque and power.


Basic principles of measurement – measurement systems, generalized configuration and functional descriptions of measuring instruments – examples. dynamic performance characteristics – sources of error, classification and elimination of error.

MEASUREMENT OF DISPLACEMENT: Theory and construction of various transducers to measure displacement – piezo electric, inductive, capacitance, resistance, ionization and photo electric transducers, calibration procedures.

MEASUREMENT OF SPEED: Mechanical tachometers – electrical tachometers – stroboscope, noncontact type of tachometer

Download UNIT-1 Material PDF | Reference-2


STRESS STRAIN MEASUREMENTS: Various types of stress and strain measurements – electrical strain gauge – gauge factor – method of usage of resistance strain gauge for bending compressive and tensile strains – usage for measuring torque, strain gauge rosettes.

MEASUREMENT OF FORCE, TORQUE AND POWER– Elastic force meters, load cells, torsion meters, dynamometers.

MEASUREMENT OF ACCELERATION AND VIBRATION: Different simple instruments – principles of seismic instruments – Vibrometer and accelerometer using this principle.

Download UNIT-2 Material PDF | Reference-2


SYSTEMS OF LIMITS AND FITS: Introduction, nominal size, tolerance, limits, deviations, fits -Unilateral and bilateral tolerance system, hole and shaft basis systems- interchangeability, deterministic & statistical tolerances, selective assembly. International standard system of tolerances, selection of limits and tolerances for correct functioning.

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

Download UNIT-3 Material PDF | Reference-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- angle dekkor- spirit levels- sine bar- sine table, rollers and spheres used to measure angles and tapers.

OPTICAL MEASURING INSTRUMENTS: Tools maker’s microscope and uses – autocollimators, optical projector, optical flats and their uses.

Interferrometry – Interference of light, Michelson’s interferometer, NPL flatness interferometer, and NPL gauge interferometer.

COMPARATORS: Types – mechanical, optical , electrical and electronic, pneumatic comparators and their uses.

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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.

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.

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.

FLATNESS MEASUREMENT: Measurement of flatness of surfaces- instruments used- straight edges- surface plates – auto collimator

Download UNIT-5 Material PDF | Reference-2


  1. Engineering Metrology / R.K.Jain / Khanna Publishers
  2. Measurement Systems: Applications & design / D.S Kumar/


  1. Measurement systems: Application and design/Doeblin Earnest. O. Adaptation/ TMH
  2. Experimental Methods for Engineers / J.P.Holman/McGraw Hill
  3. Mechanical and Industrial Measurements / R.K. Jain/ Khanna Publishers.
  4. Instrumentation, measurement & analysis / B.C.Nakra & K.K.Choudhary/TMH
  5. Engineering Metrology / Mahajan / Dhanpat Rai Publishers
  6. Engineering Metrology / I.C.Gupta / Dhanpat Rai Publishers
  7. Precision Engineering in Manufacturing / R.L.Murthy / New Age
  8. Engineering Metrology and Measurements / NV Raghavendra, L Krishna murthy/ Oxford publishers.
  9. Engineering Metrology / KL Narayana/Scitech publishers


  • CO1: Describe the construction and working principles of measuring instruments for measurement of displacement and speed and select appropriate instrument for a given application.
  • CO2: Describe the construction and working principles of measuring instruments for strain, force, Torque, power, acceleration and Vibration and select appropriate instrument for a given application.
  • CO3: Explain shaft basis system and hole basis systems for fits and represent tolerances for a given fit as per the shaft basis system and hole basis system and design limit gauges based on the tolerances for quality check in mass production.
  • CO4: Explain methods for linear, angle and flatness measurements and select a suitable method and its relevant instrument for a given application.
  • CO5: To measure the threads, gear tooth profiles, surface roughness and flatness using appropriate instruments and analyze the data.

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