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Process Control Techniques for High-Volume Production by M. Kemal Atesmen

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7

PROCESS CONTROL FOR VARIABLES: X¯ AND S CHARTS

Other important control charts for variables are X¯ and S charts. X¯ and S charts should be used when the spread of a variable is critical. If your process capability index is close to one and you are not 100% sorting for a particular variable, you should use X¯ and S charts to determine the standard deviation of your processes for that particular variable more accurately. The minimum sample size for X¯ and S charts should be 10, but sample size can go up to the 100’s depending on your production volume and on your automated voluminous data capturing and analysis capability. X¯ and S charts are treated and analyzed similarly to X¯ and R charts in Chapter 6, but instead of ranges, standard deviations ...

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