R Chart and X-Bar chart
General Dynamics, Inc. is a manufacturer of hydraulic machine tools. It has had a history of leakage trouble resulting from a certain fitting. Twenty five samples of machined parts were selected, one per shift, and the diameter of the fitting was measured.
a) Construct a X-bar and R charts for the data provided in the following attached file. R Chart and X-bar Chart – General Dynamics.xlsx
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b) What do you think of the results?
c) If the regular machine operator was absent when sample 4, 8, 14 and 22 were taken, how will the results in part b be affected?
d) A second table in the worksheet represents measurement taken during the next ten shifts, after the operator was back. What information does this table provide to the quality control manager?