Georges Renault DELTA4000 Manual Operario página 20

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English
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Table A :
Number of samples
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 to 22
23 to 25
26 to 31
32 to 35
36 to 44
45 to 51
Coefficient of position and dispersion: CPK
Tolmax X
〈
CPK = min ---------------------------- -
3σ
0
The station is " capable " if the CAM is higher than the "specified CAM".
The setting is correct if the CPK is higher than the "specified CPK".
2 - ISO STANDARD
σ
Standard deviation:
N
2
∑
( )
xi X –
i = 1
σ
= -------------------------------
N 1 –
N
∑
xi
i = 1
X = ------------- -
where is the population mean,
N
xi population value,
N number of measurements of the population
Coefficient C
1.51
1.41
1.34
1.28
1.26
1.24
1.22
1.21
1.19
1.18
1.17
1.17
1.16
1.15
1.15
1.14
1.14
1.13
1.12
1.11
1.10
1.09
1.08
– X Tolmin –
| 〉
--------------------------- -
3σ
0
DELTA4000/5000/4D/5D