How to GR&R a Vision System to measure features in silicone ie. jello

2

25yearsQE

#1
I am using a vision system between 60x and 200x to measure a molded silicone part that was later slit with a piercing blade. The objective is to measure the slit width and deviation from center. The part essentially changes every time you touch it.
My question then becomes... what measurement methods would be appropriate for a Gage R&R? My thought was to place ten parts on deck, let stabilize and then have each operator measure the ten parts once. Then reposition the parts and repeat two more times.
The operator input is to manually select what they perceive to be the center of the part based on mold ring marks and then manually pick points along the slit line at at it's ends to establish the slit offset and overall length.
 
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Miner

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#2
Re: How to GR&R features in silicone ie. jello

How is the product used? Is it in the free state or constrained? If constrained, consider measuring it in the constrained state also.
 

Bev D

Heretical Statistician
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Super Moderator
#3
Re: How to GR&R features in silicone ie. jello

I see no reason why that won't work for you. It is the standard 'popular' approach.
...of course it may not give you the best repeatability or reproducibility but that won't be as a result of your study plan.

as an aside I prefer using 30 parts measured only twice each. same number of readings per operator but this approach gives you a much better estimate of the actual measurement error (and the product variation if you need that).
 
2

25yearsQE

#4
Re: How to GR&R features in silicone ie. jello

Good point Minor, I will have to check tolerance stack-up of assembly to see if it really is constrained.
And thank you Bev.

The part is designed to have a tube enter thru the slit and return without carrying any fluid over from the other side. (up to 500 times)
 
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