Acceptable NDC for %GR&R part inspection to Tolerance (%Tolerance)

C

Calibrator24

If I'm doing a GR&R study on my gage which was being used for part inspection to tolerance, and I am using the %GR&R to TOLERANCE, would it be necessary to meet the requirements for NDC? Pls enlighten me on this matter. Thanks in advance.
 
Miner

Miner

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re: Acceptable NDC for %GR&R part inspection to Tolerance (%Tolerance)

No. ndc is a metric intended to determine whether a gage is suitable for use with SPC. See my blog on this topic for more information.
 
C

Calibrator24

Then, how can we show that the resolution or discrimination of the gauge is sufficient for the application?
 
Miner

Miner

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From my blog, to which I linked in my prior response:

Step 2: Resolution/Discrimination
Adequate resolution or discrimination means that the measurement units (inches, tenths of inches, thousandths of inches…) are sufficiently small enough to be able to "see" variation.

Stratification on a range chart is a good indication that there is a problem with inadequate resolution. The number of stratified levels on the Range Chart is an indicator of the degree of the problem. Fewer "levels" means less adequate resolution:

A rule of thumb: There should be approximately 5 levels of resolution between the control limits on the Range Chart and less than 25% of the ranges equal to zero to be considered adequate.
 
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