Gage R&R for Checking Fixture with multiple check points

T

tgranger

#1
I need some help. I need to conduct a MSA on a checking fixture (for a vehicle carpet) with multiple check points (31). Some are gap and flush, and some are cut-out or hole diameter. I am told I need to do a study of 30 parts. My question: Do I pick a single check point on the fixture to base my study on, or do I simply do a pass/fail type of study. I'm confused. Can anyone help? (3 operators, 3 trials, 30 parts........is this correct?)

Tom
 
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S

sauhiew

#2
Re: Gage RR for Checking Fixture

It's actually 10 parts, 3 operators, 3 trials. You should check all 31 points because they check different quality characteristics unless some characteristics have direct effect from others. For example in stamping so-called stack-up tolerance, the center of a hole can be affected by hole location, bending distance, and angle of bending.
 
D

Dale D. Barnes

#3
Re: Gage R&R for Checking Fixture

I agree that you should do each location on the gage separately and not as one gage. The question is are your readings variable or attribute. If it is a Go/NoGo type of gage then you can use two operators and use as few as 20 parts but I use 50 parts. But if you take variable readings then you would have to do the 3x3x10 (3 operators, 3 trials, 10 parts)
 

Jim Wynne

Staff member
Admin
#4
Re: Gage R&R for Checking Fixture

I need some help. I need to conduct a MSA on a checking fixture (for a vehicle carpet) with multiple check points (31). Some are gap and flush, and some are cut-out or hole diameter. I am told I need to do a study of 30 parts. My question: Do I pick a single check point on the fixture to base my study on, or do I simply do a pass/fail type of study. I'm confused. Can anyone help? (3 operators, 3 trials, 30 parts........is this correct?)

Tom
I'm assuming that (a) the fixture has been validated/certified and (b) it's strictly an attributes thing--you put the carpet on, and it either fits or it doesn't.

If this is true, then you just need to do a attributes study, which is covered at length in the AIAG MSA manual, Third Edition. If it's not true, please post back with more information about what the check fixture is actually supposed to do.
 
T

tgranger

#5
Re: Gage R&R for Checking Fixture

I'm assuming that (a) the fixture has been validated/certified and (b) it's strictly an attributes thing--you put the carpet on, and it either fits or it doesn't.

If this is true, then you just need to do a attributes study, which is covered at length in the AIAG MSA manual, Third Edition. If it's not true, please post back with more information about what the check fixture is actually supposed to do.
The fixture has not been certified. Submitting the MSA to the OEM will assist me with its approval. Once I place the carpet on the fixture, some cut-outs may align within tolerance band (+/- 2mm) or some may be outside the tolerance. So, the carpet may fit on the gage, but 3 out of 31 holes are not within tolerance (ex. 2mm outside tolerance). Each hole has its own reading (gap and flush....so there are two variables per check point - vertical gap between the fixture and carpet and distance horizontally between the carpet hole edge and the tolerance band). The inspector has to record (2) readings per check point. Is it feasible to place the carpet on the fixture, visual inspect each check point, and record GO / NO GO for the entire carpet (attribute study).
 
T

tgranger

#6
Re: Gage RR for Checking Fixture

It's actually 10 parts, 3 operators, 3 trials. You should check all 31 points because they check different quality characteristics unless some characteristics have direct effect from others. For example in stamping so-called stack-up tolerance, the center of a hole can be affected by hole location, bending distance, and angle of bending.
I have a spreadsheet setup to check (1 point). Can I modify it to check all (31), or do I need special software to handle this job?

These may be silly questions, but I'm learning. Thanxs.
 
T

tgranger

#7
Re: Gage R&R for Checking Fixture

I agree that you should do each location on the gage separately and not as one gage. The question is are your readings variable or attribute. If it is a Go/NoGo type of gage then you can use two operators and use as few as 20 parts but I use 50 parts. But if you take variable readings then you would have to do the 3x3x10 (3 operators, 3 trials, 10 parts)
Do you use a programmed spreadsheet or some other software?
 
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