MBA The Operations Dimension

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Presentation transcript:

MBA 642 - The Operations Dimension Quality Control MBA 642 - The Operations Dimension Busing

Causes of Variation Random Causes difficult or expensive to control e.g., outside humidity, line voltage Assignable Causes easier to correct e.g., employee error, new materials

Comparing Process Variation to Tolerance Limits

High Process Capability After Technological Process Change

Control Charts Variables - concentrates on mean for some measurable characteristic. diameter length Attribute - data is based on counts or the number of times we observe a particular event. proportion defective/non-defective go/no go proportion pass/fail

Control Limits - Variables Charts X-Bar Chart R Chart

Factors for Control Limits (Slide 1 of 2) Sample of Size n A D D 2 3 4 2 3 4 5 6 7 8 9 10 1.880 1.023 0.729 0.577 0.483 0.419 0.373 0.337 0.308 0.076 0.136 0.184 0.223 3.268 2.574 2.282 2.114 2.004 1.924 1.864 1.816 1.777

x-bar Chart Example (cont’d)

Range Chart

Warning Conditions Two successive points near limit Run of five above or below mean Trend Erratic behavior

Process Control for Attributes Proportion defective: Number of defects per unit:

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