Difference between cp and cpk

Question

Accepted Answer

Cp measures the capability of a process to meet specifications, while Cpk measures the capability of a process to meet specifications considering centering.

Cp is a short-term capability index, while Cpk is a long-term capability index.
Cp considers only the spread of the process, while Cpk considers both the spread and the centering of the process.
Cp is calculated using the formula Cp = (USL - LSL) / (6 * standard deviation), while Cpk is calculated using the formula Cpk = min(Cpu, Cpl), where Cpu = (USL - mean) / (3 * standard deviation) and Cpl = (mean - LSL) / (3 * standard deviation).
Cp should be at least 1 for a process to be considered capable, while Cpk should be at least 1.33 for a process to be considered capable and centered.
Example: If a process has a Cp of 1.2 and a Cpk of 1.1, it indicates that the process is capable but not centered.

Accepted Answer

Cp means Process capability cpk means Process capability index. Cp is grater then cpk or equal then cpk

Difference between cp and cpk

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