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I have been given the task of compiling documentation required for a PPAP submission. One of these documents require me to calculate the Cpk of the process involved. However, only 1 product can be made per every 8 minutes. I could be wrong, but this leads me to believe that my sample size would be 1 (n=1)

From my understanding, I believe I need to take least 2 samples at same time in order to calculate the Cpk (e.g. 5 samples at time 10:30pm).

How would I go about calculating the Cpk for this?

In addition, there are three Specification Limits that need measuring. Does this mean that 3Cpk's are needed?

Cheers