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Equator™ - gauging system applications

Equator™ Applications

What is a gauge R&R study?


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The purpose of a gauge R&R study is to demonstrate the capability of a gauging device to measure a specific component.

Type 1 - simple repeatability trials with one operator, one part and multiple repetitions.  The following values are used to indicate whether a measurement system is capable of measuring a feature consistently and accurately:

  • Cg: Compares tolerance with measurement variation.
  • Cgk: Compares tolerance with measurement variation and bias.

Both figures should be greater than 1.33 to show that the measurement system is capable, in some cases values greater than 1 might be acceptable. Cg indicates the spread of measurement values, Cgk also includes the bias, the offset of the group of measurement values from the nominal.

Type 2 - prove the measurements provided by the Equator system are repeatable and reproducible, regardless of operator, for a specific feature.  Tests are performed with multiple operators, multiple parts and multiple repetitions.  The measurement uncertainty due to the Equator for that particular feature is expressed as a percentage of the tolerance, in most cases this is expected to be lower than 10% but may be up to 20%.


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