Introduction to Comparators

All measuring instruments are comparators, ranging from a simple scale to a complex instrument incorporating its own standard scale. For an engineering metrologist, a comparator is an instrument used for the measurement of diameters or lengths on gauges and components, using slip gauges as a standard.

Use of comparators in metrology

  1. Comparator is required in mass production and mass production would be impossible if component parts could not be produced to close dimensional tolerances.
  2. Use of line standards such as vernier and micrometer calipers requires a considerable degree of skill if consistent results are to be obtained.
  3. Where dimensions must be checked with high degree of precision and speed in the mass production.
  4. When many dimensions are to be checked, in a very short time.

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