Gauge (gage) R&R for production equipment/fixtures

K

Kenwatch

#1
I would like to know your opinion on running a gauge R&R on a production fixture. If you are in favor of such thing, how do you see it made properly?
I am trying to figure out a way to get the equipment checked before production starts.
Any comments or suggestions are more than appreciated.
Thank you,

Ken
 
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Stijloor

Staff member
Super Moderator
#2
Re: Gauge R&R for equipment/fixtures

I would like to know your opinion on running a gauge R&R on a production fixture. If you are in favor of such thing, how do you see it made properly?
I am trying to figure out a way to get the equipment checked before production starts.
Any comments or suggestions are more than appreciated.
Thank you,

Ken
Hello Ken,

Welcome to The Cove Forums! :bigwave: :bigwave:

What is he purpose of this production fixture? Is is used as a work/part holding device or is it used to verify/check certain part characteristics?

Stijloor.
 
K

Kenwatch

#3
Re: Gauge R&R for equipment/fixtures

Hello Ken,

Welcome to The Cove Forums! :bigwave: :bigwave:

What is he purpose of this production fixture? Is is used as a work/part holding device or is it used to verify/check certain part characteristics?

Stijloor.
Thank you for welcome and for the prompt response.
My fixtures are production fixtures.
I was thinking that if check fixtures need R&R, then why not the production fixtures. I should be able to determine if they will be capable of maintaining the same position for each component.
 

Stijloor

Staff member
Super Moderator
#4
Re: Gauge R&R for equipment/fixtures

Thank you for welcome and for the prompt response.
My fixtures are production fixtures.
I was thinking that if check fixtures need R&R, then why not the production fixtures. I should be able to determine if they will be capable of maintaining the same position for each component.
Ken,

An advanced search on "Gauge R&R for machining fixtures" at The Cove Forums revealed this.
Look at the various threads + posts to see if any of this would apply to what you have in mind.

Stijloor.
 
Last edited:

Ajit Basrur

Staff member
Admin
#5
Re: Gauge R&R for equipment/fixtures

I would like to know your opinion on running a gauge R&R on a production fixture. If you are in favor of such thing, how do you see it made properly?
I am trying to figure out a way to get the equipment checked before production starts.
Any comments or suggestions are more than appreciated.
Thank you,

Ken
Hi Ken,

I would say its your call :)

The strategy for Gage R & R study for a fixture depends on :

1. They exhibit different levels of precision;
2. Instruments in the same environment produce equivalent results;
3. Operators in the same environment produce equivalent results;
4. Responses of individual gauges are affected by configuration or geometry changes or changes in setup procedures.

There is valuable info on Gage R & R at NIST - Gage R & R Study

The intent of Gage R & R focusses on Repeatability and Reproducibility.

Repeatability is the ability of the fixture to provide consistent results. This gives indication of the variability introduced by the system if the same operator measures the same part using the same fixture repeatedly.

Reproducibility is the variability introduced by the operators. This represents the variability introduced when different operators measure the same part.

Thus if you feel that the fixture is really that crucial for your quality, I would recommend you to go for it.
 
K

Kenwatch

#6
Thank you all for advices. I already looked through the threads in the forums and I could not find a satisfactory answer for my issue.
I will read further and maybe I can find something useful. I did already some trials but I am not sure if I did it right.
I used one part and three operators to check one fixture. Each operator loaded the part 10 times and measured the part location (in already established places). When I put the data in the R&R form, I considered two trials of 5 measurements each per operator. I cannot afford more measurements because of the lack of time and operators.
Any suggestions?
 
C

CMM Master

#7
If your company is ISO-9000/9001, TS16949 or any number of other certificate holders, Or if your primary customers include Government, The big 3, asian automotive or any aerospace companies, then chances are, that your production fixtures require GR&R not only to be performed prior to kick off, but on a yearly or some other frequency schedule.

It's not much of a challenge though.:sarcasm:

First you need expert authorized boundary samples. An engineer or some other specialist defines samples that, just pass or just fail the gage. These need to be kept throughout the life of the gage.
( this being the case for attribute type gages, go/nogo hole locator pins etc.. Variable gages have a different set of requirements(gages that actually give a measurement))

Then a customer or procedural prescribed number of operators test each part on the gage without prior knowledge of which parts fail or pass.

The number of samples used is procedural or customer decided as well and typically ranges between 30 and 150 samples. (With 3 operators you could technically use as few as 5 samples. Bad idea though!)

Thier results are recorded along with the sequence number.

Finally, your expert or other specialist enters the results for comparrison into an appropriate software package and you put everything away for another year or so.

I am a gage technician myself, and have made alot of time saving Excel workbooks for entering, tracking and reporting these things. If I can help at all, let me know.
 
K

Kenwatch

#8
Thank you CMM Master for clarifications.
Another thing I would like to find out is why the R&R results are changing if you change the order of the measurements?
Theoretically the result should be the same no matter the order you put the results of the measurements.
Can anybody clarify this thing to me?
Thank you in advance,

Ken
 
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