Radius Gauge R&R Study

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Golfman25

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#2
Since it doesn't give you a variable reading, I think you have to treat it as a go / no go gauge. There's a methodology in the AIAG msa book.
 
#3
Many thanks for that.
As an attribute study and with rad gauges with a descrimination of 0.25 i wondered how others had approached it ?
Again thanks for the reply
 

bobdoering

Stop X-bar/R Madness!!
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#4
What are the gages being used for? Control (process adjustment) or product verification? How are they being used - use several to find the correct one, or compare to the correct one? What is the tolerance of the radius on the part?
 
#5
In general they are being used for open tolerances (As you would expect!) But even at that to set up a study is proving a little difficult. The rad gauges are .025mm increments. Any suggestions would be welcome!
Many thanks
 

Jim Wynne

Staff member
Admin
#6
In general they are being used for open tolerances (As you would expect!) But even at that to set up a study is proving a little difficult. The rad gauges are .025mm increments. Any suggestions would be welcome!
Many thanks
Please describe what the gages are used for, and what an "open" tolerance is.
 

AMIT BALLAL

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#7
In general they are being used for open tolerances (As you would expect!) But even at that to set up a study is proving a little difficult. The rad gauges are .025mm increments. Any suggestions would be welcome!
Many thanks
We use radius gage for attribute measurement such as Ok or Not Ok. Hence it would require an attribute GRR i.e. Kappa study.

You'll need 50 parts (recommended) for measurement. Determine whether the parts are defective or not using more accurate measurement system (variable measurement system is recommended)/ system that you trust/ controlled. Based on these measurements, define reference value.
It would be better to have 20 to 30% defective parts, if available. If no defective parts available, at least take parts that are close to specification limits.
Then take 2 appraisers (at least) and these appraisers should measure each part 2 times (at least) using radius Gage.

Enter the readings in MSA format. Here are the results from google search. Please download and use the format you find useful.
attribute MSA.xls - Google Search

At end you'll get Kappa value. It should be minimum 75% (0.75).

You can also refer following link shared by Stiljoor in similar thread:
Attribute Gage study site:Elsmar.com - Google Search
 
Last edited:

Jim Wynne

Staff member
Admin
#9
Hi Amit,
Many thanks for the reply I will give that a try!
Best regards
Richard
It would be good if you could answer the questions asked, such as what the radius gages are used for and what you mean by "open tolerances." It could well be that Amit's advice is overkill in your situation.
 
#10
Good evening Jim,
Firstly apologies for not directly replying yo your post!
The radius gauges are being used for measuring machined radii in various machined components for the aerospace industry!
We mean by 'open' tolerance that it is the general drawing tolerance for machined features e.g +/- 0.25mm
Best regards
Richard
 
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