Go - No Go (Attribute) Gage R&R (Repeatibility and Reproducibility)

S

Scott Robinson

#11
To go or not to go

Hi Richard,
Have just gone through the same thing as you trying to figure out gauge r&r for attribute data. Read the MSA manual and wished I hadn't. Attached is a simple to use form I made up to satisfy our customers. I couldn't view Tim's (I don't like giving credit card details over the net to pay the 25 bucks).
Hope it is of some use.
:smokin:
 
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R

Richard

#13
Hi Scott,
I made a form by myself using the hypothesis test analyses- cross-tab method which is the first method on Chapter III MSA manual. And got the same result as the some professional software did. I can¡¯t download the attaches for the same reason as yours (I feel Internet just like a knife. Use to help people or kill).

Thanks.
 
V

vargadomonkos

#14
MSA manual

I'm pretty interested in G R&R studies, because noone seems to know it in my company. And I won this problem to be solved. Could anyone send the AIAG MSA manual for me, cause I haven't got it.
 
V

vargadomonkos

#17
Calculations for Attribute GRR

Hi,
could any of you give me a hand in calculation of UCL and LCL in case of attribute agreement analysis. For example how can one calculate or at least approximate the inverse of Beta-distribution or so. I am not interested in excel or statistical software solutions, only in the mathematical method.

THX
 
T

Tybee - 2011

#18
Gaugr R&R

Can someone tell me what is considered a god R&R study? I ave a study with a % R&R of 20.6
 

Miner

Forum Moderator
Staff member
Admin
#19
Tybee said:
Can someone tell me what is considered a god R&R study? I ave a study with a % R&R of 20.6
It depends on what the GRR is a % of. If GRR is 20% of the tolerance range, the gauge is marginally acceptable for product acceptance. If GRR is 20% of the process variation, the gauge is marginally acceptable for process control (e.g., SPC). If GRR is 20% contribution, the gauge is probably not acceptable.

The standard guidelines for acceptability of a gauge are:
  • </= 10% is ideal for GRR as a percent of tolerance if used for product acceptance and/or percent PV if used for process control, capability studies, DOEs etc.
  • Between 10% and 30% is marginal depending on importance of part characteristic, cost of gauging, etc.
  • > 30% is not acceptable

Guidelines for GRR as % contribution are:
  • </= 1% is ideal
  • Between 1% and 10% is marginal
  • > 10% is not acceptable
 
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