Gage R&R Form in Excel for Calculating Gauge R&R - Attached

T

tsmooth12

#51
Thanks Ingo1966 for the reply!

Now does anyone have an excel spreadsheet already set up to do a Study 3 or Study 4 Gage RR? If so, can you please share?

Thanks again!!
 
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Mortalis

Involved In Discussions
#52
I tried to use Automoto's 4th edition form but is seems to cause my Excel 2010 agita when I try to input the LSL and USL for the specification.

Not sure if the issue is on my end or within the file itself. Also, the part number cells are locked and will not allow a number to be input there.
 
Z

Zuzka

#53
Hi to all.
As I have just studied MSA 4 edition, I?d like to ask you help me, how to set up GRR correctly:
I want to study GRR for the parts with the specification
1.37.02-37.12 mm
2. 14.05-14.25 mm

How should I prepare the samples for the measuring by 3 operators?
How many samples should by in specification 1. and how many in specification 2.?

Zuzka
 

automoto

Involved In Discussions
#54
Hi to all.
As I have just studied MSA 4 edition, I?d like to ask you help me, how to set up GRR correctly:
I want to study GRR for the parts with the specification
1.37.02-37.12 mm
2. 14.05-14.25 mm

How should I prepare the samples for the measuring by 3 operators?
How many samples should by in specification 1. and how many in specification 2.?

Zuzka
Hi,

If you use gauge for SPC use samples that cover entire process variation. If process variation is known (Pp) you can use this data to calculate TV ? total variation and PV - part variation.
If you use gauge for measuring if the parts within tolerance you can use any type of samples.
Mark the sample then each operator should measure the samples in random order.
 
Z

Zuzka

#55
Thank you a lot for your answer.

One more question I have:
- I have 30 measured data for dimension 1, measured by operator 1 and operator 2
- I have 30 measured data for dimension 2, measured by operator 1 and operator 2

How is possible to calculate Pp correctly, please?

Regards,
Zuzka
 
Z

Zuzka

#56
Thank you a lot for your answer.

One more question I have:
- I have 30 measured data for dimension 1, measured by operator 1 and operator 2
- I have 30 measured data for dimension 2, measured by operator 1 and operator 2

How is possible to calculate Pp correctly, please?

Regards,
Zuzka
Hi all.

Could you, please, help me, how to set up GRR for destructive testing method?

I have done pull test method on the samples.
I can do pull test once on one sample. Then the sample is destroyed.
How can I set up GRR study?

Is it correct to prepare samples by the following?:
30 samples measured by 1. operator
30 another samples measured by 2. operator
30 another samples measured by 3.operator?
The samples are made from the same process (1 welding machine), produced one by one during short time.
How can I calculate EV, AV, GRR correctly?
Zuzka
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#57
Re: Gage R&R Form in Excel for calculating gauge R&R attached

Hello tsmooth12,

A Gage R&R with one Appraiser makes only sense if you have an automated Measurement process without Appraiser Influence.
Not necessarily the only time it's appropriate. I use MSA* for one operator when I am qualifying a measurement system for Problem Solving. In these cases I typically want - and need - only one operator to ensure that my measurements are reliable and because one operator can notice things that many operators could miss.

*I don't use the popular "R&R" method as described by AIAG and others. I use 30 parts, measured twice, Youden plot and I don't calculate %EV to tolerance as it is statistically invalid...
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#59
Thank you a lot for your answer.

One more question I have:
- I have 30 measured data for dimension 1, measured by operator 1 and operator 2
- I have 30 measured data for dimension 2, measured by operator 1 and operator 2

How is possible to calculate Pp correctly, please?

Regards,
Zuzka
you cannot calculate Pp from this data*. Pp is the actual process variation as quantified by the standard deviation: Pp = (USL-LSL)/6*SD
BUT Pp is not directly useful for Gage R&R. It is the SD that is directly useful. If you have historical data that you know is representative of your actual process variation you can substitute that SD for the PART VARIANCE instead of calculating it from the GAGE R&R study parts.

*IF your R&R study parts were randomly selected from a portionof the process that exhibited the full range of variation that your process has historically demonstrated, then you could use the study SD to calculate Pp. BUT most inexperienced people don't select their R&R parts in this manner.
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#60
Hi all.

Could you, please, help me, how to set up GRR for destructive testing method?

I have done pull test method on the samples.
I can do pull test once on one sample. Then the sample is destroyed.
How can I set up GRR study?

Is it correct to prepare samples by the following?:
30 samples measured by 1. operator
30 another samples measured by 2. operator
30 another samples measured by 3.operator?
The samples are made from the same process (1 welding machine), produced one by one during short time.
How can I calculate EV, AV, GRR correctly?
Zuzka
Zuzka - can you post your data? It will be easier for us to help you with this if we can use your data to demonstrate the concepts
 
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