In this example, ten parts that represent the expected range of the process variation were selected. Additionally, each part is fitted with one of two sub-components (a fixed factor), and you want to determine if this introduces part-to-part variability. Three operators measured the ten parts, four times per part (two times with each sub-component), in random order. You decide to conduct a gage R&R study (Expanded) to determine how much of your observed process variation is due to measurement system variation.
1 Open the worksheet GAGEGENERAL.MTW.
2 Choose Stat > Quality Tools > Gage Study > Gage R&R Study (Expanded).
3 In Part numbers, enter Part.
4 In Operators, enter Operator.
5 In Measurement data, enter Measurement.
6 In Additional factors, enter Subcomponent.
7 In Fixed factors, enter Subcomponent.
8 Click Terms. In Include terms in the model up through order, type 2.
9 Click Part-to-Part Variation. In Available terms, click Subcomponent to move it to Selected terms. Click OK twice.
10 Click Options. Under Process tolerance, choose Upper spec - Lower spec and type 8. Click OK.
11 Click Graphs. Under Plots of average measurements by two factors, enter Operator and Subcomponent. Do not change the defaults for the other graphs.
12 Click OK in each dialog box.