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Module 12C - IE 361 Module 12 EFC and SPM One Thing Control...

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IE 361 Module 12 EFC and SPM: One Thing Control Charting is Not Reading: Section 3.6 of Statistical Quality Assurance Methods for Engineers Prof. Steve Vardeman and Prof. Max Morris Iowa State University Vardeman and Morris (Iowa State University) IE 361 Module 12 1 / 11
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EFC and SPC In this short module, we try to make explicit the di/erence between "engineering control" (as understood, for example, by EE°s and ME°s) and "SPC." Recall from Module 10 the basic insight that Shewhart "control charting" is about process watching for purposes of change detection as illustrated in the ±gure below repeated from that module. Figure: Statistical Process Monitoring Vardeman and Morris (Iowa State University) IE 361 Module 12 2 / 11
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EFC and SPM Control Charts are NOT Process-Tweaking/Process-Guidance Tools Engineering Feedback Control is process guidance/on-line adjustment as represented in the ±gure below, where repeatedly an output Y is compared to a target value T and accordingly a change is ordered in some process variable X . Figure: Schematic of an Engineering Control Scheme Vardeman and Morris (Iowa State University) IE 361 Module 12 3 / 11
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EFC and SPM Control Charts are NOT Process-Tweaking/Process-Guidance Tools The ±gures on panels 2 and 3 and the methodologies they represent are NOT the same. Automatic online process adjustment is not the same thing as process watching for purposes of change detection.
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