Gage R&R - Destructive Test - Tensile Tester

D

Denise

#11
Atul,

Thanks for your help. I have the Wheeler book (dated 1984). I do not understand the significance of plotting the averages for each part. However, I do understand the significance of the range chart. Can you help me out?

Denise :bigwave: :bigwave:
 
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D

Denise

#12
Sean,

Thanks, great idea.

Is that done to monitor the machine variation?

How much variation do you find within the coil (between each sample)?

If there is variation, do you wonder whether it is the machine or the actual strength changes within the coil?

Denise :bigwave: :bigwave:
 
S

Sean Kelley

#13
Yes, this is done to monitor variation. We usually see very minor variation and do not know whether it is instrument error or sample variation. The key is that if something major occurs we may rerun to make sure something was wrong or at that point we know to contact Tech support and determine if the instrument needs repair or just calibration. Either way it is better than testing material on equipment that is not performing properly. Also, it saves having to reprepare samples that takes our lab techs quite a bit of time to prepare. We average 120-180 samples per day and that is a lot of sample prep wasted on an instrument that is not working properly. Hope this helps.:)
 
C

chalapathi

#16
Calibration can not replace the need for Gage R&R

howste said:
In the past (on many occasions) I have submitted calibration certificates for tensile testers instead of R&R studies in PPAPs. I have never had a customer reject one. What do your customers say?
In calibration, we are estimating Bias. Bias and R&R are different errors. Bias is OK, does not mean that R&R should be OK.
Bias is Xbar - Referene value, if you have lot of variation in repeated measurements, the Bias many be still fine and Repeatability error will be high.
It is a good idea to check R&R destructive testing methods also. My experience is that the R&R values are generally more than 30% and with better maintenance & traning of operators the errors can be reduced.
For example, in one case of Hardness measurement, we found that different operators methods of sample preparation is quite different and hence the errors were also abnormal.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#20
Physical phenomena do not play nice like dimensional measurements. Ultimate tensile strength is rarely repeatable. Yield tends to be the most repeatable. That...and of course the difficulty of getting groups of samples that the test would have to show it could tell apart. People who rubber stamp gage r&r requirements rarely have the background to truly understand what they are actually asking for. I vote for calibration, also.
 
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