Georges Renault DELTA4000 Manual Operario página 21

Process Capability: CP
IT
CP = ------
6σ
where:
• IT = tolerance interval = Max. Tol. - min.Tol.
σ = Standard deviation
•
Coefficient of position and dispersion: CPK
–
Tolmax X
〈
CPK = min ---------------------------- -
3σ
3 - NF STANDARD E 60-181
s = estimator of the intrinsic standard deviation for each mode number, where
ie
n
2
∑
( )
x – x
je e
j = 1
s = ---------------------------------- ; x
ie
n 1 –
k
1
2
∑
Di
S = -- - s
;
i ie
k
e = 1
IT
CAM = ----- -
Di
n
2
∑
( )
x – x
j
j = 1
s = ----------------------------- -
where
p
N 1 –
  x L 
L – x –
s
Cpk = Min [  ------------- -  ,  ------------- -
3s 3s
  
p
IT
Cap = ------- -
6s
p
4 - NORMAL DISTRIBUTION TEST: POPULATION UNDER 50 MEASUREMENTS (SHAPIRO-WILK
TEST)
2
1) Calculation of :
S
N
2
2
∑
( )
S = X – X
i
i = 1
n
∑
x
i
=
i 1
where
X = ------------- -
N
N : number of measurements of the population
DELTA4000/5000/4D/5D
–
X Tolmin
| 〉
--------------------------- -
3σ
n
∑
x
je
=
j 1
= --------------- - ; n = size of the sample
e
n
×
= 6 s
; IT = Tolerance interval
i
n
∑
x
j
j = 1
=
x ------------- -
e
N

s
 ]

p
6159938010-07
≤ ≤
2 e k
, and k is the number of samples.
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