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Meaningful MSA Study on Viscosity Measuring Equipment

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B

Boro Col

Starting to get Involved
#12
#12
Thanks - your response makes sense. It is the shear viscosity we are measuring. We will try your method and post how we get on.

Many thanks again.
 
Ninja

Ninja

Looking for Reality
Staff member
Super Moderator
#13
#13
Boro Col said:
Thanks - your response makes sense. It is the shear viscosity we are measuring. We will try your method and post how we get on.

Many thanks again.
Click to expand...
Hi Boro Col,

By "shear viscosity" I assume you mean the viscosity under a specific shear rate after the thixotropy has 'stabilized out'.

If so, leave a sample (spindle already in) sit stagnant for ~30min. Then put it under shear and take readings every ~30sec and plot the curve of Visc vs. Time. It should plateau. Run your GRR out on the time plateau and see if that doesn't work out for you.

Note: A programmable cone & plate viscometer can remove the operator influence to a large degree and can make the test far more repeatable in a manufacturing setting (lowering the Appraiser Variation part).

Best of luck...keep us posted!
 
E

eturkan

#14
#14
What is your outcome?

It is hard to get a good % Gage R&R. Your samples MUST represent the entire tolerance interval. If there is no variance within the parts, your Gage R%R suffers.

If I were you, I'd get 15 samples and choose 10 of the data that represents the overall tolerance interval.

If cpk>2.5 , you may also consider using tolerance % result

Are you working on tan_delta/ loss/storage modulus? You can also obtain help from your equipment's manufacture (such as TA etc)
 
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L

LUV-d-4UM

Quite Involved in Discussions
#15
#15
I gather you are an expert on this field. Can you explain this a little better for the benefit of us folks who are new in the Nested ANOVA? Do you have the right form and constants to use? Thanks
 
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