# when we say that sigma level = 3 * cp

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• #53405

sacramento
Participant

When we say that Sigma level = 3 Cp *?

cpk condition which is true?

We can then conclude that there is only one condition in which this truth and when
Cpk = Cp-0, 5 out of condition to Sigma Level = 3 * Cp is not true.

Developing the equation

Sigma Level = cp*3 (1)

sigma level= Zbench +1,5 (2)

Z bench= Cpk*3 (3)

replacement (3) in (2) we have:

sigma level= cpk*3 +1,5 (4)

cpk*3 +1,5= cp*3 (5)

replacement (4) into (1) we have:

cpk*3 +1,5= cp*3 (5)

We have isolated

Cpk =>Cp – 0.5

Only on condition of equation (7) we can state that

Sigma level = 3 * Cp

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#190005

Mikel
Member

What in the heck is the meaning of Zbench?

And what in the heck is the meaning of the +1.5?

Do they still try to sell this dogma?

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#190006

Participant

Answer 1 = Zbench = Z lont Term= Z of the table de normal curve ..remember ??

Answer 2= 1,5 is shift of the process in other words is shift de 1,5 sigma of the process (according motorola whole process is a shift of 1.5 sigma).

Answer 3= You’re right, there is a docma this case, everybody says that sigma level = 3 * Cp yet there is a unique situation in which this statement is true only when cpk = Cp-0, 5 according to information from previous email .. Grateful for your questions .. let’s stay tuned

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#190008

Guest
Participant

I would like to make the team, because working with six sigma and I think this exchange interesting in sharing ideas and opinions. In this topic I expressed importance of defining the best use of capability indices, on condition that we use and when. Thank you for the opportunity and I am available group

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