OM 300 1nd Edition Lecture 13 Outline of Last Lecture Darden Video Quality Farm to plate I Setting Chart Limits II Creating Control Charts Outline of Current Lecture I Process Capability a Process Capability Ratio b Process Capability Index II Acceptance Sampling Current Lecture Managerial Issues and Control Charts Three management decisions 1 Select points in the processes that need SPC 2 Determine the appropriate charting technique 3 Set clear policies and procedures Process Capability The natural variation of a process should be small enough to produce products that meet the standards required A process in statistical control does not necessarily meet the design specifications Process capability is a measure of the relationship between the natural variation of the process and the design specifications Process Capability Ratio o A capable process must have a Cp of at least 1 0 o Does not look at how well the process is centered in the specification range o Often a target value of Cp 1 33 is used to allow for off center processes o Six Sigma quality requires a Cp 2 0 Process Capability Index o A capable process must have a Cpk of at lease 1 0 o A capable process is not necessarily in the center of the specification but it falls within the specification limit at both extremes Acceptance Sampling These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Form of quality testing used for incoming materials or finished goods o Take samples at random from a lot shipment of items o Inspect each of the items in the sample o Decide whether to reject the whole lot based on the inspection results o Only screen lots does not drive quality improvement efforts o Rejected lots can be Returned to supplier Culled for defectives 100 inspection May be re graded to a lower specification Automated Inspection o Modern technologies allow virtually 100 inspection at minimal costs o Not suitable for all situations
View Full Document
Unlocking...