Ex_Quality.pdf - Quality Management 1 A metal fabricator produces connecting rods with an outer diameter that has a 10.01 inch specification A machine

Ex_Quality.pdf - Quality Management 1 A metal fabricator...

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Quality Management 1. A metal fabricator produces connecting rods with an outer diameter that has a 1±0.01 inch specification. A machine operator takes several sample measurements over time and determines the sample mean outer diameter to be 1.002 inches with a standard deviation of 0.003 inch. a. Calculate the process capability index for this example. b. What does this figure tell you about the process? Answer a. { ̅ ̅ } { ( ) ( ) } =0.889 b. The process capability is less than 1 and the process mean has shifted to the right . This means that the process is producing more defective items with the diameter bigger than the USL than the defective items with a diameter smaller than LSL. Further, the process has a less than 3-sigma quality because Cp < 1. This study resource was shared via CourseHero.com
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2. Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each. To set up the machine and to create a control chart to be used throughout the run, 15 samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows: Readings (In Ohms) Sample Number X1 X2 X3 X4 1 1010 991 985 986 2 995 996 1009 994 3 990 1003 1015 1008 4 1015 1020 1009 998 5 1013 1019 1005 993 6 994 1001 994 1005 7 989 992 982 1020 8 1001 986 996 996 9 1006 989 1005 1007 10 992 1007 1006 979 11 996 1006 997 989 12 1019 996 991 1011 13 981 991 989 1003 14 999 993 988 984 15 1013 1002 1005 992 Develop an x-bar chart and an R chart (Use three-sigma control limits) and plot the values. From the charts, what comments can you make about the process? (Remark: after you construct the control limits using the existing
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  • Spring '17
  • wert
  • sh, ar stu, ed d

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