Measurement, MSA, and SPC
Measurement system analysis and statistical process control turn measurement into evidence. Without them, every dimensional result is just an opinion. With them, the PPAP submission, the control plan, and the day to day decisions on the line all rest on numbers you can defend. The guides in this topic cover Gauge R and R acceptance criteria, the difference between Cpk and Ppk and when each one applies, and how a control plan ties measurement frequency to process capability. Useful for the engineer setting up a new study and for the team trying to interpret last week is data without restarting the argument from scratch.
3 articles in this topic
Featured article

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.
Read the full guideGauge R and R
Setup, acceptance criteria, and how MSA results feed PPAP.
Control Plan
Translating capability and MSA into a control plan that survives audits.
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