GR&R

The purpose & scope   

1.To assist in determining the following major problems of all gauging systems used throughout the manufacturing process

  • Precision
  • Variation
  • Acceptability

2.To furnish a comparison of the accurracy of one measuring device against another
3.Why is the accuracy of the gauge wrong?

  • Measurement errors
  • Incorrect usage
  • Equipment variation

4.The factors of the gauge system error

  • Accuracy
  • Stability
  • Repeatability
  • Reproducibility

Accuracy

  • The difference between the observed average of measurements and the true average of the same measurements.
  • Using the highest precision measuring device to get the true average.
GR&R--Accuracy

GR&R–Accuracy

Repeatability

  • The amount of variation in the gauge when the same parts and part characteristics are measured several times by the same person.

 

GR&R--Repeatability

GR&R–Repeatability

Reproducibility

  • The amount of variation in the average of the measurements when different people use the same gauge on the same parts and part characteristics.
GR&R--Reproducibility

GR&R–Reproducibility

Stability

  • The periodic variations that occur due to enviromental changes,power fluctuations, wear or deterioration of the gauge .

 

GR&R--Stability

GR&R–Stability

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