Can anyone share a completed Gage R & R on a Micrometer?

Would someone be willing to share a completed GRR on a digital 0-1 outside micrometer?
Thanks in advance.

Re: Can anyone share a completed Gage R & R on a Micrometer ?

There is one here but the GR&R is 41.1 %

https://elsmar.com/Forums/showpost.php?p=300851&postcount=1

Lets wait for more examples !

Re: Can anyone share a completed Gage R & R on a Micrometer ?

LOL...that's what I would expect from a micrometer...
After beating our head against micrometer GRR% from 35-95% we bought a CMM.

I'm interested to see if anyone managed to pass (< 10%) with a handheld micrometer.

Hi!!!

Attached herewith two GRR studies performed on Micrometer 0-25mm with least count 0.01mm.


% GRR observed after this study is 18% & 13 % (Which is acceptable to our customer).


Thanks,
Amit

Re: Can anyone share a completed Gage R & R on a Micrometer ?

Ninja said:

LOL...that's what I would expect from a micrometer...
After beating our head against micrometer GRR% from 35-95% we bought a CMM.

I'm interested to see if anyone managed to pass (< 10%) with a handheld micrometer.

Click to expand...

Almost impossible. But, it has been in use since the advent of fire. Suddenly some statistician says its "no good" any longer. Go figure.

Re: Can anyone share a completed Gage R & R on a Micrometer ?

Golfman25 said:

Almost impossible. But, it has been in use since the advent of fire. Suddenly some statistician says its "no good" any longer. Go figure.

Click to expand...

Hahaha, agreed.

I wonder if said statistician actually said,

"Oh heavens, they are that bad?!?
How can I develop a gage reliability test complex enough to convince people to not use micrometers,
but to still hide from them that all of their old work is now in question and not have them blame it all on me? "

It all depends on the tolerance. Here's one with less than 10% GRR; note that the tolerance is ?0.004", not the far tighter tolerances that have been discussed to date. The product measured is a rubber seal (like a gasket, not a rubber pool toy). Some information is redacted.:ca:

Doing a GRR on an outside micrometer and having it come out with favorable results is a rare feat. In most cases you see the biggest problem in the Appraiser Variation. One has to develop that certain "feel" to use a micrometer correctly. Over the years I have seen everything from a person with that (feather like) touch, to someone who cranks it down so hard that you could actually pick the part up like it was being held by a "C" Clamp and carry it across the shop floor.

Totally agreed. My poor GRR results with a micrometer (or calipers for that matter) were dominated by appraiser variation.

Equipment variation tends to be high too, if the tolerance is down in the 0.001" range, but Appraiser variation is overwhelmingly larger.

LRE67 said:

to someone who cranks it down so hard that you could actually pick the part up like it was being held by a "C" Clamp and carry it across the shop floor.

Click to expand...

I had a customer do that once on thin walled part, changing the dimension several thousands and rejecting the parts. Stubborn mule drove us crazy.