Gage R&R - Percent of Tolerance or Percent of Variation?

S

sinan_guler

#1
hello;
I have a small problem with MSA. I need your help. This is my problem. I have got measurement data. But the USL and LCL is very high so from minitab %R&R is %Study*Var %44 but %Tolerance is %13. Could you help me which of these do i have to select.?

i have selected 25 parts. So i need to know k3 for 25 parts. this is my measurement data. I need to know my %R&R value.

for product USL:1,600 and LSL (1,500)

thank you very much
 

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N

NumberCruncher

#3
Hi sinan

I would need to put your data into minitab, which I don't have. But just looking at the data, you should check the data input. There are two values which are outliers. They may be correct, but it would be a good idea to go back to the original written records to check what was written.

Here are the relevant columns (4 and 9). I have highlighted the suspect data
4_______19
1.505___1.515
1.514___1.519
1.517___1.519
1.517___1.518
1.514___1.504
1.514___1.519

NC
 
D

debyang

#4
Hi,Sinan guler


Because there are some points out the R chart’s UCL per your data, it indicates that your MS was not stable (as NC posted ), you have to investigate what ‘s wrong and fix the problems before going to worry about the % is good or not.


Only when R chart is stable, the GRR results can be accountable . You may go further to compare the GRR TV with product tolerance, or any known process SD or product SD. If the GRR TV is quite small thus makes your GRR% terribly large( might due to poor sampling), in order not to waste any resource on not necessary improvement effort on the measurement system, replace the GRR TV with other SD is the most practical measure. The best substituting TV should be the smallest one of the product tolerance and the process SD or the product SD.


Once you chose other TV, do remember to recalculate the PV(=sqrt((new TV)^2-(study GRR )^2))and ndc, so you won’t have good GRR% but poor ndc such contradictory issue.
 
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