ME2304 ENGINEERING METROLOGY AND MEASUREMENTS lecture notes | (Common to Mechanical and Automobile - V semester) |by R.Anirudhan
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UNIT I CONCEPT OF MEASUREMENT
General concept – Generalised measurement system-Units and standards-measuring
instruments: sensitivity, stability, range, accuracy and precision-static and dynamic
response-repeatability-systematic and random errors-correction, calibration -
Introduction to Dimensional and Geometric Toleranceing - interchangeability,
UNIT II LINEAR AND ANGULAR MEASUREMENT
Definition of metrology-Linear measuring instruments: Vernier, micrometer, Slip gauges
and classification, - Tool Makers Microscope - interferometery, optical flats, -
Comparators: limit gauges Mechanical, pneumatic and electrical comparators,
applications. Angular measurements: -Sine bar, Sine center, bevel protractor and angle
UNIT III FORM MEASUREMENT
Measurement of screw threads: Thread gauges, floating carriage micrometermeasurement
of gear tooth thickness: constant chord and base tangent method-Gleason
gear testing machine – radius measurements-surface finish: equipment and parameters,
straightness, flatness and roundness measurements.
UNIT IV LASER AND ADVANCES IN METROLOGY
Precision instruments based on laser-Principles- laser interferometer-application in
measurements and machine tool metrology- Coordinate measuring machine (CMM):
need, construction, types, applications.- computer aided inspection.
UNIT V MEASUREMENT OF MECHANICAL PARAMETERS
Force, torque, power:-mechanical, pneumatic, hydraulic and electrical type-Pressure
measurement - Flow: Venturi, orifice, rotameter, pitot tube –Temperature: bimetallic
strip, thermocouples, pyrometer, electrical resistance thermistor.