ndc is closely associated with % Study Variation, but has no association whatsoever with % Tolerance.
Acceptability of the gauge depends on the use:
- Process control: ndc, % Study Variation (or % Process in Minitab)
- Inspection: % Tolerance
- Dual Purpose (Inspection and Process Control): ndc, % Study Variation (or % Process in Minitab) and % Tolerance
If you have not found them , I recommend reading my
blog on MSA.