Hello guys,

Our NDC number is 40, I have been going through the calculations but all seems to be ok (our trials are within 0.001 R),
are there any concerns or negative implications of ndc number being very high, I know over 5 is ok? Should I worry about this?

Cheers

:caution:

Ei!
First of al welcome to the Cove!!!:applause:

NDC of 40. Means your Meas Sys is very precise. MAy i know how many parts did you used in your MSA?

Hi Reynald,

We used 10 parts, 3 trials per 3, Xdiff and R are to 3rd decimal, so we got
R&R quite small value. PV does not vary too much so I reckon it is the R&R which defines more ndc value.

The only problem is I do not have much experience with this to know if ndc over 40 means something is not ok, so I have been going around this but can not find anything wrong with our calculation,


Thanks for the welcome

NDC of 40 for 10 parts is really high. This could mean 2 things:
1. There is a distinc part to part variation during your MSA, or
2. You are actually using a gage more precise than what is needed for the measuring process.

If part to part variation is not that high, then NDC of 40 could only mean your measuring devide is very good.

Let's wait from others for other conlusions. I'm sure somebody there could give a deeper insight.:yes:

NDC of 40 for 10 parts is really high. This could mean 2 things:
1. There is a distinc part to part variation during your MSA, or
2. You are actually using a gage more precise than what is needed for the measuring process.

If part to part variation is not that high, then NDC of 40 could only mean your measuring devide is very good.

Let's wait from others for other conlusions. I'm sure somebody there could give a deeper insight.:yes:

reynald is correct. Expanding on #1, if the variation of parts exceeds the actual process variation, it will artificially inflate the ndc.

The variation of the sample parts must equal the variation of the process or the MSA will be invalid.

Ned-Sa, welcome to the Cove.

Yes, that may happen if you are mixing parts with different nominal dimensions into one study. Can you post your data here?

Hello Atul, all

Thanks for the help on this matter, I believe all is in good order with our ndc. In few days we have an audit and I will post measuring data with remarks from auditor on our MSA.

:cfingers:

Regards


Ned