Statistical Process Control Audits for Dual-Sourced Component Verification
Dynamic volume re-allocation tied to audited Cpk capability metrics aligns dual-supplier process means, mitigating bimodal assembly defect risks.
Centered Capability
Meaning
Dimensional alignment metric evaluates how closely the process average matches the target value in the center of the tolerance zone. Centered capability is the ratio of the allowable spread to the actual six-sigma spread when no bias is present. This value represents the maximum potential of a process if all centering errors were removed.
Mean Accuracy
Production settings must be adjusted to ensure that the middle of the output distribution aligns with the blueprint nominal. If the actual average drifts from this center, centered capability remains high while the actual yield drops. Skilled operators use offset values to pull the process back into alignment.
Batch Stability
Variance within a single production lot is compared to the overall tolerance to determine if the equipment is capable of hitting the target. A high centered capability indicates that the machine is precise even if it is currently inaccurate. Improving the process requires a simple shift of the mean rather than a reduction in overall noise.
Certification Value
Quality certificates include this figure to prove that the factory has the hardware necessary to meet strict requirements. This centered capability shows that the machine can produce the required precision once it is properly dialed in for the specific part, and the documentation provides a benchmark for future maintenance needs. Buyers use this number to screen potential suppliers for high precision mechanical components where tolerances are extremely tight and the cost of failure is high.
The document serves as a record of the technical capability of the facility at a specific point in time and is often attached to the master service agreement.