Metrology Defined, Needs of inspection, Principle and methods of measurements, Sources of error, precision and
accuracy, Objectives of Metrology and Measurements, Standards of measurement: - Line, End and Wave length
standards. Limits, Fits and Tolerances: Interchangeability, selective assembly, limits, tolerances and fits (Indian
standard), Fundamental deviation, Hole & Shaft basis systems, limit gauges, Taylor’s principles of designs of limit
Needs of comparator, Basic principle, use, classification and characteristics of comparators, Mechanical, electrical
& electronic comparator, pneumatic comparator and comparator sensitivity. Angle Measurements: Sine bar; its
use, limitations, errors. Slip gauges and its use. Auto-collimator: - principle, construction and application.
Measurement of taper angle