Results for: Gageaiag.MTW Gage R&R Study - ANOVA Method Two-Way ANOVA Table With
ID: 354420 • Letter: R
Question
Results for: Gageaiag.MTW
Gage R&R Study - ANOVA Method
Two-Way ANOVA Table With Interaction
Source DF SS MS F P
Part 9 88.3619 9.81799 492.291 0.000
Operator 2 3.1673 1.58363 79.406 0.000
Part * Operator 18 0.3590 0.01994 0.434 0.974
Repeatability 60 2.7589 0.04598
Total 89 94.6471
Alpha to remove interaction term = 0.25
Two-Way ANOVA Table Without Interaction
Source DF SS MS F P
Part 9 88.3619 9.81799 245.614 0.000
Operator 2 3.1673 1.58363 39.617 0.000
Repeatability 78 3.1179 0.03997
Total 89 94.6471
Gage R&R
%Contribution
Source VarComp (of VarComp)
Total Gage R&R 0.09143 7.76
Repeatability 0.03997 3.39
Reproducibility 0.05146 4.37
Operator 0.05146 4.37
Part-To-Part 1.08645 92.24
Total Variation 1.17788 100.00
Process tolerance = 8
Study Var %Study Var %Tolerance
Source StdDev (SD) (6 * SD) (%SV) (SV/Toler)
Total Gage R&R 0.30237 1.81423 27.86 22.68
Repeatability 0.19993 1.19960 18.42 14.99
Reproducibility 0.22684 1.36103 20.90 17.01
Operator 0.22684 1.36103 20.90 17.01
Part-To-Part 1.04233 6.25396 96.04 78.17
Total Variation 1.08530 6.51180 100.00 81.40
Number of Distinct Categories = 4
Gage R&R for Measurement
Answer the following questions
1. In the session window output, what is the percent contribution for part-to-part? _____
2. In the session window output, what is the percent contribution for total Gage R & R? _____
3. After answer questions 1 and 2 above, which do you, believe causes more of the variation, part-to- part or the measuring system? ________________________________
4. If you knew that according to Automobile Industry Action Group (AIAG) that you can determine whether or not your measurement system is acceptable using the following guidelines
If the Total Gage R&R percentage in the %Study Var column (% Tolerance, %Process) is:
Less than 10% - the measurement system is acceptable
Between 10% and 30% - the measurement system is acceptable depending on the application, the cost of the measuring device, cost of repair, or other factors
Greater than 30% - the measurement system is unacceptable and should be improved
If you are looking at the % Contribution column, the corresponding standards are:
Less than 1% - the measurement system is acceptable
Between 1% and 9% - the measurement system is acceptable depending on the application, the cost of the measuring device, cost of repair, or other factors.
What have you determined about this measurement system based on the %Study Var column for total Gage R &R?___________________________________________________
_________________________________________________________________
5. Looking at the graph window output, what does the components of variation graph in the top upper left hand corner indicate?__________________________________________________
__________________________________________________________________________
6. Looking at the measurement by operator graph, which operator seems to measure differently than the others? ________________
Explanation / Answer
Answer :
1. In the session window output, the percent contribution for part-to-part is __3.96% (this comes from 100 - 96.04)___
2. In the session window output, the percent contribution for total Gage R & R is _27.86% _(this is given in the above tabel only___
3. After answer questions 1 and 2 above, we believe the causes of more variation is the measuring system, because the repeatability is around 18.42% , which is much higher than than the part to part variation of 3.96%. Thus in the MSA , the repeatability variation is higher than the part to part variation.
4. The limits as per this points will be
Upto 10% - It is acceptable
10% to 25% - It is acceptable with improvement action plan to improve the MSA
More than 25% - Not acceptable , needs immediate action to imporve the MSA.
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