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Hi all,
we are checking an assembling process in which the optimal position of a component is not in the centre of the tolerance range, but on one side of it. Hence, we decided to use the capability index Cpmk instead of the traditional Cp - Cpk.
First question: do you think it makes sense if the T value (the target) is - at the same time - the lower tolerance limit?
Second question: if yes, do you think we should refuse the qualification of this process, because of its poor Cpkm value (Cpkm = 0,32)?
You can find figures and pictures in the attached worksheet.
Thank you all.
Silvestri
we are checking an assembling process in which the optimal position of a component is not in the centre of the tolerance range, but on one side of it. Hence, we decided to use the capability index Cpmk instead of the traditional Cp - Cpk.
First question: do you think it makes sense if the T value (the target) is - at the same time - the lower tolerance limit?
Second question: if yes, do you think we should refuse the qualification of this process, because of its poor Cpkm value (Cpkm = 0,32)?
You can find figures and pictures in the attached worksheet.
Thank you all.
Silvestri
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(another bit of info to my knowledge, thanks)
you can use it as an indicator but don't try to relate it to Cpk standards (if you want to use it, use Cpk insteed), you can meassure your process and if your process get worst or better you will notice allright with it, but the meaning will be different.