Desoutter Delta Wrench 150 Nm, User Manual, Page: 140 / 184

Part Number
Issue
Date
Page 6159937790
12
03/2018
140 / 184
03/2018 140 (184)
The σ
i
is calculated as follows:
dn
W
i


Where dn is calculated from the following table based on the number of samples:
N dn
10 ÷ 16 1.128
18 1.693
20 ÷ 28 2.059
30 ÷ 100 2.326
110 ÷ 5000 3.078
NOTE :
σ
i
refers to the whole set of samples.
CAM is calculated as follows:
i
LTL UTL
CAM

6


Where
LTL is the lower tolerance limit
UTL is the upper tolerance limit
The average of the M
j
is calculated as follows:
N
X
M
ij
j


Where:
X
ij
is the i-th sample of the j-th group.
Considering M
min
and M
max
as the minimum and maximum averages, the C
mk
is calculates as follows:







 
3
,
3
min
max min
M UTL LTL M
C
mk