Limit Gauges (metrology)


LIMIT GAUGES

  • A limit gauge is not a measuring gauge. Just they are used as inspecting gauges.
  • The limit gauges are used in inspection by methods of attributes.
  • This gives the information about the products which may be either within the prescribed limit or not.
  • By using limit gauges report, the control charts of P and C charts are drawn to control invariance of the products.
  • This procedure is mostly performed by the quality control department of each and every industry.
  • Limit gauge are mainly used for checking for cylindrical holes of identical components with a large numbers in mass production.


Purpose of using limit gauges
  • Components are manufactured as per the specified tolerance limits, upper limit and lower limit. 
  • The dimension of each component should be within this upper and lower limit.
  • If the dimensions are outside these limits, the components will be rejected.
  • If we use any measuring instruments to check these dimensions, the process will consume more time.
  • It is just enough whether the size of the component is within the prescribed limits or not. For this purpose, we can make use of gauges known as limit gauges.