Elite QandA


What does Cpk 1.67 mean?


  1. What does Cpk 1.67 mean?
  2. What is a good Cpk value?
  3. What does a Cpk of 1.5 mean?
  4. What does a PPK of 1.0 mean?
  5. What is difference between Cpk and PPK?
  6. How do you calculate Cpk?

What does Cpk 1.67 mean?

Excellent, CapableCPK >1.67 (Excellent, Capable)

What is a good Cpk value?

A Cpk value less than 1.0 is considered poor and the process is not capable. A value between 1.0 and 1.33 is considered barely capable, and a value greater than 1.33 is considered capable. But, you should aim for a Cpk value of 2.00 or higher where possible.

What does a Cpk of 1.5 mean?

True mathematical Six Sigma is Cp=Cpk=2. Their definition, with a Cpk = 1.5, allows for a shift in the mean of 1.5 Sigma. The adage that 'Six Sigma' equals 3.4 ppm defects comes from this definition. Because of this shift, most of the defects are on one side of the distribution.

What does a PPK of 1.0 mean?

Ppk is an index of process performance which tells how well a system is meeting specifications . If Ppk is 1.0, the system is producing 99.73% of its output within specifications. The larger the Ppk, the less the variation between process output and specifications.

What is difference between Cpk and PPK?

So the key takeaway is that Cpk is the potential of a process to meet a specification (short term) while Ppk is how the process actually did (long term). Another way to look at the difference is that Cpk is used for a subgroup of data, while Ppk is used for the whole process.

How do you calculate Cpk?

The formula for the calculation of Cpk is Cpk = min(USL - μ, μ - LSL) / (3σ) where USL and LSL are the upper and lower specification limits, respectively. A process with a Cpk of 2.0 is considered excellent, while one with a Cpk of 1.33 is considered adequate.



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