Desoutter Delta Wrench 150 Nm, User Manual, Page: 133 / 184

Part Number
Issue
Date
Page 6159937790
12
03/2018
133 / 184
133 (184) 03/2018
Coefficient of position and dispersion: Cpk






 

0
min
0
max
3
,
3
min
 
Tol X X Tol
C
pk
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”.
9.2.2 ISO standard
Standard deviation:
σ
 
1
1
2





N
x x
N
i
i

Where:
N
x
x
N
i
i

 
1
(population mean)
x
i
= population value
N = number of measurements of the population
Process Capability: C
p

6
IT
Cp

Where:
IT (Tolerance Interval) = Max. tolerance - Min. tolerance
σ = Standard deviation
Coefficient of position and dispersion: C
pk





  

 
3
,
3
min
min
max
Tol X
X Tol
C
pk