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GRR on ID with set of pin gauges
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GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
GRR on ID with set of pin gauges
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Some Related Topic Tags
anova (analysis of variance), gage r&r (repeatability and reproducibility), pin gages
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  Post Number #1  
Old 16th May 2018, 02:07 AM
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Please Help! GRR on ID with set of pin gauges

Hi all,
I've repeatedly see engineers conducting GR&R (ANOVA method) with a set of standard pin gauges in certain increment, like 0.01mm. With such kind of measurement method, is there potential issue that will be challenged by customer or auditor ?

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  Post Number #2  
Old 16th May 2018, 07:54 AM
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Look! Re: GRR on ID with set of pin gauges

The biggest potential issue I see is that you may not have sufficient resolution. Low resolution can affect your results by making them better or worse than they truly are.
  Post Number #3  
Old 16th May 2018, 08:32 AM
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Re: GRR on ID with set of pin gauges

Hi Miner,
Yes. You are correct that the resolution will be limited by the increment of those pin gauges. You generally can't go further than 0.005 increment and I doubt if the hand feeling of 0.005 is distinguishable or not. So I usually recommend engineer to explain to customer and seek for their endorsement. The chance customer will accept this is not low to my experience especially when the holes are functioned to have shaft to fit into, ie. the pin gauge measurement simulate better the real world situation as in their assembly process. If you use point touch measurement equipment you may not get the least thru hole diameter.
  Post Number #4  
Old 16th May 2018, 12:54 PM
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Re: GRR on ID with set of pin gauges

to expand on Miner's point - the resolution is a relative thing. If the tolerance range is small compared to the pin resolution, then you get 'chunky data'. chunky data is defined as when there only ~2-5 possible results in the tolerance range. This will result in an overestimate of the measurement error SD and your R&R will most likely fail.

If pins are the best choice (because you need to detect the minimum through hole diameter) then I recommend using a categorical gage R&R. This would be a more accurate and useful assessment of the measurement system.
Thank You to Bev D for your informative Post and/or Attachment!
  Post Number #5  
Old 16th May 2018, 10:37 PM
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Re: GRR on ID with set of pin gauges

Pins are really no different than the resolution of the lines on a dial or any other gage. I have used "tenths sets" as variable data very readily - if the process variation or tolerance (whichever was applicable) was wide enough. Some people think it is not "continuous" data, but, again, it as continuous as the dashes on your dial gage! One of the best ways to measure MMC including fit.

As far as explaining to a customer, never assume they are more expert than you. Be prepared to train them, if need be.
Thanks to bobdoering for your informative Post and/or Attachment!
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