CQI CQI Metrology & Measurement Systems 2

Question 1

What does GR&R stand for in measurement systems analysis?

Accepted Answer

Gage Repeatability and Reproducibility

Answer

GR&R stands for Gage Repeatability and Reproducibility, a study used to evaluate the variation within a measurement system.

Question 2

What does 'repeatability' measure in a GR&R study?

Accepted Answer

Variation when the same operator measures the same part multiple times with the same instrument

Answer

Repeatability measures the variation attributed to the measurement instrument when used repeatedly under identical conditions by the same operator.

Question 3

What does 'reproducibility' measure in a GR&R study?

Accepted Answer

Variation between different operators using the same instrument

Answer

Reproducibility measures the variation that occurs when different operators use the same instrument to measure the same parts.

Question 4

A GR&R study result showing 30% of process variation attributed to the measurement system is generally considered:

Accepted Answer

Marginal and may require improvement

Answer

A GR&R value between 10% and 30% is considered marginal and may require corrective action depending on the application.

Question 5

What is the minimum recommended number of operators in a standard GR&R study?

Accepted Answer

3

Answer

A standard GR&R study uses 3 operators, 10 parts, and 2-3 replications to adequately characterize measurement system variation.

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