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  Measurement, Test and Calibration
  Gage R and R for sorting gage

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Author Topic:   Gage R and R for sorting gage
zeeeee
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posted 29 May 2001 03:41 PM           Edit/Delete Message   Reply w/Quote

We currently use a leaktester to inspect for leakrates on parts we produce. This inspection is done as a 100% sort. We exspect approx 5-25% of the parts we inspect to not pass. Our customer has requested that we reduce our upper limit on our test based on gage R and R results. I understand the reasoning behind his request, but is there any data/information I could use to justify testing at 100% of the upper spec tolerance?

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Marc Smith
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posted 03 June 2001 04:30 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Anyone have any advice for this person?

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Laura M
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From:Rochester, NY US
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posted 03 June 2001 09:47 PM     Click Here to See the Profile for Laura M   Click Here to Email Laura M     Edit/Delete Message   Reply w/Quote
Zeeeee...

I was in a similar situation with leak testing. Our test limit was at 10% less than the spec for the same reason - based on manufactures stated error - and verified with leak test masters. Example - if spec was 3 cc/min, upper test limit was 2.7.

I really don't have any advice to change things. Like Dr. Deming said "no two things are the same - and if they were you couldn't measure them accurately enough to prove it" or something like that.

Interesting thing in our case was we didn't typically have too many that failed in the margin of error. They were either "real good" or "real bad." Borderline parts rarely existed. You may be able to learn something from the parts in between the test spesc and actual spec that can help. Without knowing more about the process, that's the best I can offer.

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