GRR For destructive test
June 10, 2008 at 2:55 pm #50251
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I am always thankful to all of you who helped me in the past on my queries regarding six sigma projects. Here is another question:
How do I perform GR&R for the push out test?
Push out test is basically done to verify the fastener welded to part is good. We have a push out test equipment where the die holds the part and the force is applied from the top to the head of bolt / nut.
Appreciate all comments.
Thanks0June 10, 2008 at 3:14 pm #172716
Here’s a simple destructive GRR test:
Get parts that are as homogeneous as possible. Randomly separate them into groups. Now you have some choices:
(1) Assign a group to each operator and let him/her measure all the parts in the group (operator-to-operator reproducibility).
(2) If there’s only one operator or if operator has no effect on the measurements, then assign a group to each of several measurement gages (gage-to-gage reproducibility).
(3) If there’s only one gage, then set it up multiple times and assign a group to each setup (setup-to-setup reproducibility).
In Minitab, run General Linear Model. Designate your factor (operator, gage, or setup) as a random factor. To calculate % Reproducibility, you will need the expected mean squares and a little statistical help.0June 10, 2008 at 5:56 pm #172722
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