What is SPC ,difine the cp.cpk or pp ppk

Question

Accepted Answer

SPC stands for Statistical Process Control. CP, CPK, PP, and PPK are statistical indices used to measure process capability.

SPC is a method used to monitor and control processes to ensure they are within acceptable limits.
CP (Process Capability) is a measure of how well a process meets specifications.
CPK (Process Capability Index) is a more robust measure that takes into account both the process mean and variability.
PP (Process Performance) measures how well a process is performing relative to its specifications.
PPK (Process Performance Index) is similar to CPK but considers the long-term process performance.
These indices help assess if a process is capable of producing products within the desired specifications.
For example, a CPK value of 1.33 indicates that the process is capable of producing within 4 standard deviations of the mean.
Higher values of CP, CPK, PP, and PPK indicate better process capability and performance.

Accepted Answer

SPC (statically process Control) means Define the process result by the Statically data.

CP(Process Capability) means define the process width, and capability of process make parts define tolerance.

CP value required 1 above.

CPk(process capability index) means define the process centre.

Cpk value required 1.33 above

Cp, cpk use regular production part, and pp, ppk use As the part under Development.

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