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X bar and R chart, Cp

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The specification height for a small pin is 20 +/-.05 millimeters. The cutting process has
a standard deviation of 0.018 millimeters. Calculate the Cp index for this process. From this index is the process in control.

I am given certain data-- How do I need to set up an X-Bar and an R-chart with the data I'm given

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This posting contains solution to following problem on process capability index Cp, X bar and R chart

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The next step in this memo creation is the creation of the capability index.

The specification of the height for a small pin that goes into a fuel injection system is 20 +/- 0.05 millimeters. The cutting process has a standard deviation of 0.018 millimeters. Calculate the Cp index for this process. From this index, is the process in control? Explain to Mr. Noble if this process is in control.
Cp = 0.926 <1.

The process is not in control. This is because the Process capability index is<1.0. This means that the production process does not have the capability of producing pins that meet specifications.
As this process does not have the capability of ...

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