DESIGNING A CONTROL CHART EXAMPLE Fujiyama Electronics, Inc. has been having 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 4 boards each were taken from shipments from the supplier as shown in the data listed below. Construct x and R charts for the process using the following data. DATA Sample No Samples 1 4.92 4.26 4.94 4.29 2 4.65 5.54 5.00 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 4.70 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 5.50 5.05 13 5.79 3.83 4.30 4.78 14 4.92 4.80 4.75 5.59 15 5.68 5.74 4.65 5.20 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 4.30 5.47 4.27 4.34 23 6.07 4.97 5.51 5.02 24 5.11 4.90 5.91 4.66 25 4.50 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 4.70 5.50 6.04 4.30 29 5.87 5.30 5.78 5.07 30 4.41 4.75 4.95 5.11
DESIGNING A CONTROL CHART EXAMPLE
Fujiyama Electronics, Inc. has been having 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 4 boards each were taken from shipments from the supplier as shown in the data listed below.
Construct x and R charts for the process using the following data.
DATA
Sample No |
|
Samples |
|
|
1 |
4.92 |
4.26 |
4.94 |
4.29 |
2 |
4.65 |
5.54 |
5.00 |
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 |
4.70 |
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 |
5.50 |
5.05 |
13 |
5.79 |
3.83 |
4.30 |
4.78 |
14 |
4.92 |
4.80 |
4.75 |
5.59 |
15 |
5.68 |
5.74 |
4.65 |
5.20 |
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 |
4.30 |
5.47 |
4.27 |
4.34 |
23 |
6.07 |
4.97 |
5.51 |
5.02 |
24 |
5.11 |
4.90 |
5.91 |
4.66 |
25 |
4.50 |
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 |
4.70 |
5.50 |
6.04 |
4.30 |
29 |
5.87 |
5.30 |
5.78 |
5.07 |
30 |
4.41 |
4.75 |
4.95 |
5.11 |
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