Best way to evaluate the differences between 2 gauges

0

02SCvette

#1
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
 
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Miner

Forum Moderator
Staff member
Admin
#2
First, read my blog entry on the comparison of two gages.

Then I recommend that you test and disregard the data from the first test result of each part. Next, randomly assign the parts to a tester for the second test, following by using the other tester for the third test. This will randomly spread any variation caused by differences between the 2nd and 3rd test across both testers.

Analyze the data as discussed in my blog entry.
 
0

02SCvette

#3
Thank you for the response. I appreciate the information. Since the first value tends to be higher, what type of GR&R would you conduct on each set up? Because the first value is typically higher, I had cycled the parts before beginning the GR&R on the original gauge a few years ago. By doing this the results dropped from over 40% to around 10%. I went with 10 parts, 3 operators, 3 trials.

It has been discussed that we should consider it to be a destructive test since the values are lower after the initial test. Thoughts on using that technique?

Thanks again.
 

Miner

Forum Moderator
Staff member
Admin
#5
Thank you for the response. I appreciate the information. Since the first value tends to be higher, what type of GR&R would you conduct on each set up? Because the first value is typically higher, I had cycled the parts before beginning the GR&R on the original gauge a few years ago. By doing this the results dropped from over 40% to around 10%. I went with 10 parts, 3 operators, 3 trials.

It has been discussed that we should consider it to be a destructive test since the values are lower after the initial test. Thoughts on using that technique?

Thanks again.
If the subsequent results after the first stay stable, a standard, crossed R&R study is appropriate. A nonreplicable, nested study is only appropriate if the results continued to drop.

The R&R study is focused on the measurement variation, not the mean. As long as the parts stabilize, you are in good shape.
 
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