Understanding Process Capability Index (Cpk) is crucial in Statistical Process Control (SPC). It measures a process's ability to meet specifications, providing insights into performance and stability. Higher Cpk values indicate better process capability, ensuring consistent, high …

When the process’s mean is outside the customer specification limits, the value of Cpk will be negative. To satisfy most customers, we generally want a Cpk of at least 1.33 [4 sigmas] or higher. Cpk can have an upper and lower value reported.

Process capability index (Cpk) is a statistical tool, to measure the ability of a process to produce output within customer’s specification limits. In simple words, it measures producer’s capability to produce a product within customer’s tolerance range.

A Cpk value less than 1.0 is considered poor and the process is not capable. A value between 1.0 and 1.33 is considered barely capable, and a value greater than 1.33 is considered capable. But, you should aim for a Cpk value of 2.00 or higher where possible.

Process Capability and performance (Pp, Ppk, Cp, Cpk) are specification indicators relative to process dispersion and process centering. Process capability is a statistical measurement of a process’s ability to produce parts within specified limits consistently.

Apr 9, 2020 · Cpk is a measure of process performance capability. Cpk indicates the shifting or closeness of the process average from the target or mean value. Cpk should always be looked into, it is used to find out whether the process is capable of meeting the customer’s requirements or not i.e. Cpk ≥1.33.