![]() ![]() Data collection sheet for the group Xbar- s chart. ![]() Ten yokes are measured every hour.ĭata Collection Sheet Table 1. To monitor the uniformity of the inside widths, a group chart is set up at the milling machine to track the width at locations a, b, and c.īecause the production volume is very high, and the same characteristic is being measured at three different locations on the part, a group Xbar- s chart is selected. There have been complaints from the assembly department that some of the yokes have a taper on the inside width. This yoke is machined from an aluminum casting. Review the following example-an excerpt from Innovative Control Charting 1-to get a sense of how a group Xbar- s chart works.įigure 1. Group Xbar-s charts help you assess changes in averages and the standard deviation across measurement subgroups for a characteristic.
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