INSPECTION AND MEASUREMENT

MEASUREMENT AND INSPECTION
1. Metrology
2. Inspection Principles
3. Conventional Measuring Instruments and
Gages
4. Measurement of Surfaces
5. Advanced Measurement and Inspection
Techniques

Measurement
Procedure in which an unknown quantity is compared to a known standard, using an
accepted and consistent system of units

  • The measurement may involve a simple linear rule to scale the length of a part
  • Or it may require a sophisticated measurement of force versus deflection during a tension test
  • Measurement provides a numerical value of the quantity of interest, within certain limits of accuracy and precision

Inspection
Procedure in which a part or product feature, such as a dimension, is examined to determine whether or not it conforms to design specification

  • Many inspections rely on measurement techniques, while others use gaging methods
  • Gaging determines simply whether the part characteristic meets or does not meet the design specification
  • Gaging is usually faster than measuring, but not much information is provided about feature of interest

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