Fujiyama Electronics, Inc. Essay

1379 WordsMay 18, 20146 Pages
Fujiyama Electronics, Inc. has had difficulties with circuit boards purchased from an outside supplier. Unacceptable variability occurs between two drilled holes that are supposed to be 5 cm apart on the circuit boards. Thirty samples of four boards each were taken from shipments from the supplier as shown in the data from the worksheet below. Observations Sample 1 2 3 4 1 4.92 4.26 4.94 4.29 2 4.65 5.54 5 5.42 3 5.77 5.26 4.76 4.79 4 6.25 4.88 5.66 4.44 5 5.27 5.41 6.02 4.91 6 5.22 5.38 5.08 4.65 7 5.47 4.68 4.56 4.7 8 5.71 4.54 4.17 4.87 9 5.24 5.58 4.72 5.41 10 4.42 5.18 4.79 4.73 11 5.14 4.26 4.71 5.48 12 4.92 5.78 5.5 5.05 13 5.79 3.83 4.3 4.78 14 4.92 4.8 4.75 5.59 15 5.68 5.74 4.65 5.2 16 5.43 4.81 5.27 4.96 17 4.79 6.04 4.47 5.18 18 4.43 5.08 3.69 6.43 19 6.35 5.95 6.29 5.89 20 5.03 4.66 5.25 4.46 21 6.32 6.09 5.57 5.91 22 4.3 5.47 4.27 4.34 23 6.07 4.97 5.51 5.02 24 5.11 4.9 5.91 4.66 25 4.5 5.24 4.86 4.35 26 4.91 4.79 5.74 5.03 27 4.65 4.71 4.81 5.32 28 4.7 5.5 6.04 4.3 29 5.87 5.3 5.78 5.07 30 4.41 4.75 4.95 5.11 After using the information provided above and running calculation we are ready to input the information on the X-Bar Chart. Getting the averages of the Samples we find that our center line for the X-Bar Chart is 5.1 and further calculation gives us lower and upper variation of 0.79 making the LCL 4.31 and the UCL 5.89. With this information we can now graph the data on the chart as shown below. At initial review we can see that we have two samples out of the control limits numbers 19 and 21. Beyond that it appears that the averages for the remaining samples are within the control limits. For now we will hold off on further discussion about these two points and come back to that later. LCL x-bar 4.31 Center 5.1 UCL x-bar 5.89 Next we will work on the R-Bar Chart. Once we complete the calculations
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