A
Annette
A statement has been made in our company that if the control limits are set to +/- 3 sigma and the data is in control then the Cpk is 1.33. Is this correct?
Annette said:Thanks for your input. This is the thinking behind this. If the control limits are set to +/- 3 sigma and all data is within the control limits then the Cpk meets 1.33. They want to be able to look at the control chart only instead of looking at the Cp and Cpk on the other screens.
Question for you: If the customer wants a 1.55 cpk, yet we are struggling to provide a 1.33 on just 30 parts, what can I do to increase my cpk? My parts are within the tolerance of +-.001 already. If I widen out the tolerance, I get a better number, but the customer doesn't want that. What's next?
What's next?
Question for you: If the customer wants a 1.55 cpk, yet we are struggling to provide a 1.33 on just 30 parts, what can I do to increase my cpk? My parts are within the tolerance of +-.001 already. If I widen out the tolerance, I get a better number, but the customer doesn't want that. What's next?