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Problem 8-32
PCDrives
Process Capability Analysis - X-Bar and R-charts
Note: This spreadsheet has been modified to use the sample statistics, without requiring the sample data. The process capability calculations relied upon the estimated standard deviation = R-bar/d 2
This spreadsheet is designed for up to 50 samples, each of a constant sample size from 2 to 10. Enter data ONLY in yellow-shaded cells.
Enter the number of samples in cell E6 and the sample size in cell E7. Then enter your data in the grid below.
Click on sheet tabs for a display of the control charts. Specification limits may be entered in cells N7 and N8 for process capability.
Number of samples (<= 50) 15 Process Capability Calculations Six sigma 56.5
5Upper specification 95 0.884
Lower specification 45 0.93
Grand Average A2 D3 D4 d2 0.83
Average Range 0.58 0 2.11 2.33 0.83
DATA 12345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
1
2
3
4
5
6
DO NOT MODIFY THIS TABLE
Control Chart Factors
Sample size (2 - 10)
68.567
21.920
Cp
Cpu
Cpl
Cpk
75
80
85
Prob. 8-32 X-bar Chart
Averages
Lower control limit
Upper control limit
Center line
35
40
45
50
Sample number
Prob. 8-32 R-Chart
Ranges
Lower control limit
Upper control limit
Center line
