What are Control Charts?

 

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What are Control Charts?

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What are Control Charts?

Control charts give a statistical signal that a process has gone out-of-control so the operator can make the necessary adjustments to bring the process back into control.

  • The chart itself canít control the process. The control chart provides a signal so the operator can take action on the process.

A process that is stable is in-control. If the process changes, we get a signal from the control chart that it has gone out-of-control.

Adjusting a process when it is not statistically out-of-control is considered over-adjustment and results in increased process variation.

Control charts can be used to measure product characteristics or in-process parameters.

  • Measuring an in-process parameter is the best way to monitor a process because it may provide a signal that the process is going out-of-control before bad product is made.

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