DEK高级培训资料.pdf - 第216页
Your turn…again! A dif ferent archer als o has a standard d eviatio n of 2 cm. However h e fires with an of fset of 7 cm ! Calculat e his Sigma, Cp and Cpk Issue 2: July 2007 Sigma = Cp = Cpk = 25/2 = 12.5 Unchang ed Unc…
Your turn…!
An archer fires arrows at a target. He performs
with a standard deviation of 2 cm. The size of
the target (tolerance) is +/- 25 cm. Calculate his
Sigma, Cp and Cpk
Issue 2: July 2007
Sigma =
Cp =
Cpk =
25/2 = 12.5
50/12 = 4.17
25/6 = 4.17
50cm
Your turn…again!
A different archer also has a standard deviation
of 2 cm.
However he fires with an offset of 7 cm !
Calculate his Sigma, Cp and Cpk
Issue 2: July 2007
Sigma =
Cp =
Cpk =
25/2 = 12.5
Unchanged
Unchanged
Lower
50/12 = 4.17
18/6 = 3
TOLERANCE TOLERANCE
Cp = 2
Cpk = 2
Cp = 2
Cp = 2
Cpk = 2
Cp = 4
Cp and Cpk examples
Issue 2: July 2007
Cp = 2
Cpk = 1
Cp = 2
Cpk = 1
Cp = 2
Cpk = 0.5
Cp = 4
Cpk = 1
Cp = 8
Cpk = 1
Cp = 1
Cpk = 1