Acceptable Gage R&R - What is acceptable %error for Gage R&R

J

Jim Jakosh

#1
I am interedted in finding out what and acceptable %error is for Gage R&R? Is it different for different industries? Should it alowasy be targeted at a certain %? How is that determined by any of your companies?

Thanks, Jim Jakosh........Grand Rapids, Mi
 
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A

Al Dyer

#2
If you are automotive you could use the ranges outlined in the PPAP manual,

10%
20%
30%

and continuously try to reduce the R&R as continuous improvement projects.

I know of no steadfast rules per se, just that a large part of the decision is based on the, specifications, operator experience, customer requirements, part use etc...

Any MSA gurus that can help me out here?
 

Atul Khandekar

Quite Involved in Discussions
#3
According to the manual:
Upto 10% of "Study Variation" : Acceptable
10-30%: Acceptable on the basis of usage/criticality of measurement etc.
>30% : Not acceptable


However, you could also compare with:
1. 'Total Tolerance' on the dimesion under study: If process capability is very good, GRR may actually turn out unaceptable as % of Study variation, but may be negligible as compared to tolerance. and
2. 'Process Variation' on the dimension being measured. This can be obtained from your SPC studies.

I am not sure if 10-30 rule should also apply to these two comparisons.
 
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