Gage R&R on a Load Cell fixture that tests the resistance of a Headrest

D

disaac

#1
So I have a fixture that tests the resistance of a headrest to make sure that the post don?t fail and make it fall to its full-down position. I don?t think that we need or even can perform a Gage R&R with this test but my engineers think the opposite. We are the ones who set the value of how much pressure is applied by adjusting the air pressure; we are not measuring the product. Thoughts?
 
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Miner

Forum Moderator
Staff member
Admin
#2
Tell us a little more about how the test is performed. Does it apply a proof load, or does it increase the load until the headrest slips? Is it automated or manual?
 
D

disaac

#3
All it is is a load cell mounted onto the cylinder that is operated by two push button valves. Depending on the setting of the air presser dictates how much pressure is applied to the headrest. Its a proof load test.
 
D

disaac

#4
The problem is that the current process isn’t accurate. I guess if it was fully automated and designed to stop right when the set value is reached it would be 100% accurate all the time. Well assuming that the load cell is calibrated. The values I get have a range of 25 over the proof load. We hold the valves around 3 sec after the cylinder stops to make sure it’s the most accurate but once I remove the Headrest and then place it back the reading will be different. My guess is that the foam is also interfering with it being repeatable.
 

Miner

Forum Moderator
Staff member
Admin
#5
Refer to the following post on performing R&R studies on push/pull testers. This may be the best approach.

Your situation (using a proof load to pass/fail the product) is really an attribute R&R. Unless I am misunderstanding you. To me applying a proof load means to apply a static load equal to the requirement and evaluating whether the headrest remains in position (pass) or drops (fails). Because the headrest mechanism is relatively complex and deals with highly variable factors such as surface finish and the resulting coefficient of friction, you are experiencing large variation in the within-product performance. This will muck up the R&R results.

The Instron white paper to which I directed you, removes the highly variable product and replaces it with a less variable product (i.e., a spring with a similar spring rate).
 
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