05-Average-Range Charts-class

05-Average-Range Charts-class - Edited by Foxit Reader...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Section 5 - Variable Control Charts & Average-Range Charts UGA FDST 4090/6090 - (c) W.C. Hurst 2009 1 Variable Control Charts William C. Hurst FDST 4090/6090 (2009) Variable Control Charts • Process stabilization Maintain process EXAMPLES OF USE: – Weight: fill, net, drained (g, lb, oz) – Temperature –V o l um e(m llo z FDST 4090/6090 © W.C. Hurst 2009 – Maintain process control • Process improvement – Volume (ml, l, oz) –pH –A w (water activity) –% B r ix RH – Thickness (micrometer) – ppm Types of Variable Charts •x -R - s FDST 4090/6090 © W.C. Hurst 2009 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 2009 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 2009 n = 5 n = 1 Average – Range (x-R) Charts FDST 4090/6090 © W.C. Hurst 2009
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Section 5 - Variable Control Charts & Average-Range Charts UGA FDST 4090/6090 - (c) W.C. Hurst 2009 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 2009 in or out of statistical control.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/15/2010 for the course FDST 4080 taught by Professor Pegg during the Spring '10 term at University of Georgia Athens.

Page1 / 12

05-Average-Range Charts-class - Edited by Foxit Reader...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online