Thoughts on Audit Finding for not doing Gage R and R for Visual Inspection

G

GeoGrif

#1
We just went through our TS Cert Audit and recieved a finding for not having Gage R&R for Visual Inspection. We do Plastic Injection Molding, automotive parts so a good part of our requirements are visual for contamination, short shot etc. Question is, do you all think that this should be part specific or could I simply come up with samples of various parts and use that. The idea being that in effect you are rating the equipment, in this case the inspector so the parts should not matter as much as the conditions.

Thoughts?
 
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G

guruprasadb

#3
Yes we can do attribute type study for defect specific, but samples should cover entire variation in defect.
 

Kales Veggie

People: The Vital Few
#6
We just went through our TS Cert Audit and recieved a finding for not having Gage R&R for Visual Inspection. We do Plastic Injection Molding, automotive parts so a good part of our requirements are visual for contamination, short shot etc. Question is, do you all think that this should be part specific or could I simply come up with samples of various parts and use that. The idea being that in effect you are rating the equipment, in this case the inspector so the parts should not matter as much as the conditions.

Thoughts?
If the types of defects and the criteria are the same for your products, yes, you can. Try to commonize and maybe have a few "exceptions".

You have to start out with training of the operators and inspectors, to make sure they are "calibrated".

We used to have a sample board with sample defects, a small card showing defect size and surface type.

Attribute studies are very difficult to do correctly (i.e. creating representative NG sample).
 

Rameshwar25

Quite Involved in Discussions
#8
I understand that for visual defects, only cross tabulation method can be used and in this case grr can not be calculated.
Attribute GRR is calculated using signal detection method for that characteristic which is checked using attribute gauge but actual value can be determined by variable gauge. For visual defects, like short mould etc, actual value can not be determined, hence there is no question of calculating GRR.

Moreover, attribute MSA can be done where non-conforming parts are being manufactured i.e. cpk is equal to or less than 1. Or there is any customer complaint regarding that characteristic. Auditors usually refer the event of non-conformance found internal or external in their objective evidence while raising NC.

Regards
Rameshwar
 
Last edited:

noelb

Starting to get Involved
#9
Re: Audit Finding, not doing Gage R and R for visual inspection.

If it is listed on the Control Plan, a GR&R must be performed. Please see page 27, Section 7.6.1 Measurement System Analysis
 
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