How to Run a Gauge R&R Study (and Why a Passing %GRR Can Still Fail the Part)
A Gauge R&R study can clear the 10% line and still be worthless, because the number is being read against the wrong denominator. A worked study, run through QualityEngineer.ai's own Analyze module, showing what %GRR against tolerance hides, why NDC catches it, and how Element 8 coverage finds the gauge nobody studied at all.
Gauge R&R Acceptance Criteria: %GRR, NDC, and What AIAG MSA Requires
A Gauge R&R study passes when %GRR is under 10% and NDC is at least 5. Between 10% and 30% is conditional. This guide covers the AIAG MSA thresholds, what %GRR and NDC mean, which values trigger rejection, and what to do when a measurement system does not pass.
Cpk vs Ppk: Which Process Capability Index to Use for PPAP
Cpk and Ppk measure process capability differently and are not interchangeable on a PPAP submission. Here is what each one measures, which sigma each uses, and what PPAP Element 11 actually requires.