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Process Control Techniques for High-Volume Production
book

Process Control Techniques for High-Volume Production

by M. Kemal Atesmen
October 2016
Intermediate to advanced content levelIntermediate to advanced
149 pages
3h 17m
English
CRC Press
Content preview from Process Control Techniques for High-Volume Production

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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Publisher Resources

ISBN: 9781315350110