Surface Finish Gage R&R

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#1
Received in my personal e-mail"

> We have a problem to achieve good results on surface finish GR&R. We are using
> actual machined part to run GR&R. We are using 10 parts, 3 operator, 3 trial.
> GR&R calculate using minitab software, stud variation(number of standard
> deviation) is 6.0 and process tolerance i.e. spec tolerance.
> Please provide any example, I will be appreciated for your help.

Any takers on this one?
 
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Mike S.

Happy to be Alive
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#2
I don't completely understand the writer's message, but I will suggest one thing: Don't use an "actual machined part" to do the GR&R as the SF variation within the part is unknown. I would suggest using a surface finish standard, preferably one with Ra similar to the expected values of the machined parts, to do the GR&R.
 
D

Darius

#3
IMO, in the making of R&R, an issue is almost always missing, "RATIONAL SAMPLING & SUBGROUPING", I ask allways to the guys that work with me to tink R&R as a control chart (I tink is not new for you, but for many...).

And what is about? ,I tink almost always forget when teaching R&R, the importance of maximizate the between samples (or samples) and minimizate the within sample variation (or trials). Even I told them to try to take all th posible variation of the process in account (meanning the highest and the lowest values that can be obtained).

:bonk: IMO or the measure system doen't work or rational sampling was not achived.
 

The Taz!

Quite Involved in Discussions
#4
IMHO. . . being a destructive test to start with, you cannot re-trace the same track and get suitable results. Suggest you look at Repeatability against a known standard. . . or defer to annual calibration (Or other suitable frequency) and inspection of the stylus to detect excessive wear or chipping at scheduled intervals based on usage.
 
T

Tom Slack

#5
I'm not sure what "good results" mean, need more details. Does this person want advice on data diagnostic methods? Should expect variability in decreasing order to be part to part, operator to operator, trial to trial. I also like to take the residuals and plot them up in the order they were done.

Tom
 
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