Consider theandRchart that you established in Exercise 6.9 for the piston ring process. Suppose that you want to continue control charting piston ring diameter usingn=3. What limits would be used on theandRchart?
Consider the piston ring data shown in Table 6.3. Assume that the specifications on this component are 74.000 =0.05 mm.
TABLE 6.3
Inside Diameter Measurements (mm) for Automobile Engine Piston Rings
Sample Number
Observations
si
1
74.030
74.002
74.019
73.992
74.008
74.010
0.0148
2
73.995
74.001
74.011
74.004
0.0075
3
73.988
74.024
74.021
74.005
0.0147
4
73.996
73.993
74.015
74.009
74.003
0.0091
5
74.007
73.989
74.014
0.0122
6
73.994
73.997
73.985
0.0087
7
74.006
74.000
0.0055
8
0.0123
9
10
73.998
73.990
0.0063
11
0.0029
12
0.0042
13
73.983
74.012
0.0105
14
73.967
73.984
0.0153
15
73.999
0.0073
16
0.0078
17
73.986
0.0106
18
74.018
0.0070
19
0.0085
20
74.013
74.020
0.0080
21
73.982
22
0.0074
23
0.0119
24
25
74.017
0.0162
Σ = 1850.028
0.2351
=74.001
=0.0094
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