M
mcammaert
Dear All,
I would like to have your support/opinions about a special topic again.
I was analyzing some capability studies and encountered a case that I never encountered before.
The target value (in this case 7.2) was the same as the lower limit. So the drawing specification was saying 7.2 +0.3 -0. Off course, when you want to calculate a Cpk, this will be too low since the supplier is not aiming on the middle of the tolerance, what is also requested on the drawing.
Apart from that you can also say that the data is normally distributed with following parameters:
n = 50
Average = 7.28
Median = 7.29
Mode = 7.29
Skewness = 0.1723
Standard Deviation = 0.02997
Max = 7.36
Min = 7.21
Cpk = 0.91
Could you guys help me out drawing some conclusions concerning the capability? Do I need to use other formulas, other tolerances??
Thank you in advance!I would like to have your support/opinions about a special topic again.
I was analyzing some capability studies and encountered a case that I never encountered before.
The target value (in this case 7.2) was the same as the lower limit. So the drawing specification was saying 7.2 +0.3 -0. Off course, when you want to calculate a Cpk, this will be too low since the supplier is not aiming on the middle of the tolerance, what is also requested on the drawing.
Apart from that you can also say that the data is normally distributed with following parameters:
n = 50
Average = 7.28
Median = 7.29
Mode = 7.29
Skewness = 0.1723
Standard Deviation = 0.02997
Max = 7.36
Min = 7.21
Cpk = 0.91
Could you guys help me out drawing some conclusions concerning the capability? Do I need to use other formulas, other tolerances??