Is my measurement system acceptable?

According to AIAG1 guidelines, if your measurement system's variation is less than 10% of process's variation, then it is acceptable. To evaluate your process variation, compare the Total Gage R&R contribution in the %StudyVar column (%Tolerance, %Process) in your output with the values in the table.
Percentage of process variation Acceptability
Less than 10% The measurement system is acceptable.
Between 10% and 30% The measurement system is acceptable depending on the application, the cost of the measurement device, cost of repair, or other factors.
Greater than 30% The measurement system is not acceptable and should be improved.

Guidelines using variance components

This table contains corresponding guidelines using variance components. To evaluate your variance components, compare the %Contribution column in your output with the values in the table.
Percentage of variance components Acceptability
Less than 1% The measurement system is acceptable.
Between 1% and 9% The measurement system is acceptable depending on the application, the cost of the measurement device, cost of repair, or other factors.
Greater than 9% The measurement system is not acceptable and should be improved.
Important

The AIAG also states that the number of distinct categories into which the measurement system divides process output should be greater than or equal to 5.

1 Automotive Industry Action Group (AIAG) (2010). Measurement Systems Analysis Reference Manual, 4th edition. Chrysler, Ford, General Motors Supplier Quality Requirements Task Force
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