Process Capability Studies


Process capability studies tells you how well your process or product meets specifications. Process capability baseline numbers predicts current and future defects for any given measurement characteristic.

The term for process capability is CpK.

This Data Analysis Video teaches you the basic tools for understanding, summarizing, and making future predictions with your collected data. Includes MS Excel templates.

Data Analysis Video

CpK Guidelines


CpK Calculation Elements

Easy to calculate process capability if you have these 3 items:

This Data Analysis Video teaches you the basic tools for understanding, summarizing, and making future predictions with your collected data. Includes MS Excel templates.

Data Analysis Video

CpK Equation

Lower number of the 2 below equations

(High Specification – Data mean) / (3*standard deviation)

or

(Data mean – Lower Specification) / (3*standard deviation)


CpK Interpretation

  • The closer the data average is to the nominal specification, the higher the Cpk.
  • The smaller the standard deviation, the higher the CpK
  • The closer the average is to the upper or lower specification the lower the CpK

Process Capability and Defects.

Definition of a defect: When a part is beyond the specification, the part is consider a defect.

See the below table for calculation of defects per million parts after calculating the CpK.

This Data Analysis Video teaches you the basic tools for understanding, summarizing, and making future predictions with your collected data. Includes MS Excel templates.

Data Analysis Video

Process capability studies are a basic tool of process improvement.





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