13. MSA – Type I Gage R&R
Type I study helps observer to evaluate respective gauge’s repeatability (Cg) and bias (Cgk), these 2 types of indicators can help to analyze gauge consistency and correctness of the gauge.
Calculated equation is given below:
Example for type I calculation is given below:
One of the inspection gauge’s length results has a measuring average of 1.71351 mm with a standard deviation of 0.002115 mm, while the reference value for the gauge indicated 1.708 mm. The specification tolerance is ±0.07 mm.
The calculated results indicated that Cg and Cgk exceeds both 1.33 (min value), these 2 indicator shows that the gauge is capable to measure repetitively and has high accuracy for reading value. The following control chart is the summarized example for the Cg/Cgk plotting.
