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I am being asked to evaluate the differences between 2 gauges and the best way to qualify the new gauge.
The assembly involves 2 plastic parts that are snapped together within seconds of being molded.
The test is to record the amount of force it takes to unsnap the parts.
The original tester is a force gauge with a custom holding fixture.
The new tester is a different model force gauge with a new custom design holding fixture. (The customer supplied both holding fixtures and motorized force test stands)
One of the issues is repeatability. The first test value is typically higher than the results if the same 2 parts are snapped back together and the test repeated. The values seem to stabilize after the initial test so if the first test reported 4 pounds, the 2nd through 10th test would result in a range of 2.5 - 2.7 pounds (just an example).
I believe the holding fixture design change will be the the largest factor. The original design uses an air bladder to grab the part evenly. The new holding fixture uses a cam actuated arm that grabs the part.
So based on this, how should I conduct the GR&R's and rationalize the use of the new gauge.
Your comments would be greatly appreciated.
Thanks,
Mike
The assembly involves 2 plastic parts that are snapped together within seconds of being molded.
The test is to record the amount of force it takes to unsnap the parts.
The original tester is a force gauge with a custom holding fixture.
The new tester is a different model force gauge with a new custom design holding fixture. (The customer supplied both holding fixtures and motorized force test stands)
One of the issues is repeatability. The first test value is typically higher than the results if the same 2 parts are snapped back together and the test repeated. The values seem to stabilize after the initial test so if the first test reported 4 pounds, the 2nd through 10th test would result in a range of 2.5 - 2.7 pounds (just an example).
I believe the holding fixture design change will be the the largest factor. The original design uses an air bladder to grab the part evenly. The new holding fixture uses a cam actuated arm that grabs the part.
So based on this, how should I conduct the GR&R's and rationalize the use of the new gauge.
Your comments would be greatly appreciated.
Thanks,
Mike