III. Cpk (Process Capability Index) of capable processes are ones with a ratio/index of 1.33 (4...

 

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III. Cpk (Process Capability Index) of capable processes are ones with a ratio/index of 1.33 (4 sigma) or greater. (25 points) You are the process improvement manager and have developed a new machine to cut insoles for the company's top-of-the-line running shoes. The company's goal is no more than 3.4 defects per million. The insoles cannot be more than +/- .001 of an inch from the thickness specification of .250". The new process has a mean = .250 inch and a standard deviation = .0005 inch. a) Should you replace the existing machine which has a Cpk of 1.0? b) If the insoles can be +/- .002" (instead of .001") from the required .250", what is new the Cpk and would you replace the existing machine? c) What else can be considered to improve the Cpk? III. Cpk (Process Capability Index) of capable processes are ones with a ratio/index of 1.33 (4 sigma) or greater. (25 points) You are the process improvement manager and have developed a new machine to cut insoles for the company's top-of-the-line running shoes. The company's goal is no more than 3.4 defects per million. The insoles cannot be more than +/- .001 of an inch from the thickness specification of .250". The new process has a mean = .250 inch and a standard deviation = .0005 inch. a) Should you replace the existing machine which has a Cpk of 1.0? b) If the insoles can be +/- .002" (instead of .001") from the required .250", what is new the Cpk and would you replace the existing machine? c) What else can be considered to improve the Cpk?