![]() Sample Size Determination (Capability Indices) Capability index: Cpk Estimate: 1.33 Relative error: 10.0% Confidence level: 95.0% The required sample size is 154. In my last column, I was asked about a capability index called C pk.C pk is a measure of a process’ ability to conform to specification. Also, the machine might be stableĪs the bumper sticker says, “Shifts Happen” and so we generally want to use the slightly more liberal process capability of C pk ≥ 1.33. But if any section of the material was bad, it could get through. On the machine I ran I had 3, 6 and even a 9 CPK. I think that might be 1 part in a million or such would be bad. The magic measurement for CP or CPK is 1.33.A high value for Cp and low value for Cpk means the process is precise (narrow distribution) but work needs to be done to get the mean centered around the midpoint of the specification limits. ![]() >1.33 or >1.67 are typical acceptability levels for Cp. ![]() What does cpk 1.33 mean keyword after analyzing the system lists the list of keywords related and the list of websites with related content, in addition you can see which keywords most interested customers on the this website But what does this mean to the mold designer or mold maker? It means that the higher the Cpk requirement is, the closer to For products or parts to be validated, they typically must pass a capability study with a process capability index (Cpk) of 1.33 or 1.67.
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