Process Capability
Quality
Process Capability (Cp/Cpk)
Process Capability
Indices comparing process variation with tolerance; Cpk also considers centring. Often Cpk of at least 1.33 is required.
Examples
- 01A shaft process with Cpk 0.9 produces out-of-tolerance parts.
- 02After centring the process, Cpk rises to 1.5.
- 03Customers require capability proof for critical features.