Destructive Attribute Gage R&R without LSL/USL

O

olso99

#1
Hello,
Can anyone advise how to conduct an attribute R&R on a destructive test without upper or lower spec limits? I cannot find this in AIAG MSA v4.

This is for an impact tester that destroys the test sample when impacted.

Visual review/assessment of the surface of the impacted test sample leads the assessor to conclude either pass or fail.

Failure is defined as removal of paint on impacted surface in excess of boundary sample.

There is no lower limit.
There is only too much paint removed after impact(fail) or not(pass).

The purpose of the R&R is to be able to confidently detect good vs. bad parts, not process control.

Any advice would be much appreciated.

Thx:bigwave:
 
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B

Barbara B

#3
Maybe it's a dumb question, but why don't you use a set of samples with known reference values (pass/fail) and let every operator decide a few times for each sample of the set if it passes or fails?

You could afterwards use the Cross-Tab method to analyze the results (see MSA 4th, p. 133ff. for details).
 
Last edited by a moderator:

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#4
If the actual evaluation is the visual condition of the parts after impact, I would consider attribute gage R&R, with pass/fail samples.
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#5
olso99 you are describing a classic 'attribute' R&R situation. if you are not required to use AIAG approach you can consider the methods in the document I attached here.
 
E

eturkan

#6
I was about to add a new vocabulary to my Gage R&R Dictionary.
Destructive Attribute Gage R&R..I am glad that is not the case.

I am not sure what is the outcome but, I'd prepare sample boards/pictures as an aid to improve Attribute % Gage R&R
 
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