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05-Average-Range%20Charts-class

05-Average-Range%20Charts-class - Section 5 Variable...

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Section 5 - Variable Control Charts & Average-Range Charts UGA FDST 4090/6090 - (c) W.C. Hurst 2010 1 Variable Control Charts William C. Hurst FDST 4090/6090 (2010) Variable Control Charts Process stabilization Maintain process EXAMPLES OF USE: – Weight: fill, net, drained (g, lb, oz) – Temperature – Volume (ml l oz) FDST 4090/6090 © W.C. Hurst 2010 – Maintain process control Process improvement – Volume (ml, l, oz) – pH – A w (water activity) – % Brix – % RH – Thickness (micrometer) – ppm Types of Variable Charts • x-R • x- s FDST 4090/6090 © W.C. Hurst 2010 μ , σ • x-MR Average and Range Charts (x-R) 1. Select measurable characteristic and form rational subgroups 2. x tracks 4. Control limits set based on common cause variation present 5. As subgroup size increases control limits FDST 4090/6090 © W.C. Hurst 2010 3. R tracks increases, control limits become closer to process average, which makes chart more sensitive to small variations in process, but inspection costs also increase Distribution of Individuals and Averages FDST 4090/6090 © W.C. Hurst 2010 n = 5 n = 1 Average – Range (x-R) Charts FDST 4090/6090 © W.C. Hurst 2010
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Section 5 - Variable Control Charts & Average-Range Charts UGA FDST 4090/6090 - (c) W.C. Hurst 2010 2 Problem 1 The Quality Assurance Manager at a DelMonte fresh-cut plant has been asked by management to monitor the filling process for freshly-cored pineapple rings to determine if their weights are FDST 4090/6090 © W.C. Hurst 2010 in or out of statistical control.
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