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Author Topic:   FMEA
John Bero
posted 30 November 2000 03:53 PM           Edit/Delete Message   Reply w/Quote
I have been developing PFMEAâs for at least 10 years and for the first time one of my work associates insisted that our method of determining the occurrence ranking was incorrect. My method of determining the occurrence ranking is based on the failure rate through statistical analysis (not assumptions) on the process being performed (the output). My associate believes that the occurrence ranking is based on what the process receives from the previous process or incoming component variations. My focus is on the occurrence of process failures in relation to product/process specifications of the process being evaluated,.

What is your take on this?
Is the occurrence ranking based on variation goining into the process or is it based on the process out-put?

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Al Dyer
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Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 30 November 2000 04:26 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
I have always been taught and believe that occurrence is the projected failure rate of failure mode which is the output of the process.


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Marc Smith
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Posts: 4119
From:West Chester, OH, USA

posted 30 November 2000 08:44 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Same here, Al. Occurance is the probability (ah, hemmm - rated from 1 to 10 in the case of automotive) that the process under evaluation will output the defect.

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Kevin Mader
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Posts: 575
From:Seymour, CT USA
Registered: Nov 98

posted 01 December 2000 08:13 AM     Click Here to See the Profile for Kevin Mader   Click Here to Email Kevin Mader     Edit/Delete Message   Reply w/Quote
I third the motion on the floor.



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Rick Goodson
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Posts: 102
From:Wuakesha, Wisconsin, USA
Registered: Aug 2000

posted 01 December 2000 09:39 AM     Click Here to See the Profile for Rick Goodson   Click Here to Email Rick Goodson     Edit/Delete Message   Reply w/Quote
How about some source material to support your case.

AIAG Potential Failure Mode and Effects Analysis (FMEA) Page 37 (Process FMEA). "Occurence is how frequently the specific failure cause/mechanism is projected to occur (listed in the previous column)." The previous column is the Potential Cause(s)/Mechanisms of Failure. "Potential Cause of Failure is defined as how the failure could occur, described in terms of something that can be corrected or can be controlled" It goes on to list examples all of which relate to the assembly, manufacturing, etc. process such as torquing, inadequate lubrication, etc. There is no reference to reliability of the incoming parts.

You can find the same information in Stamatis' book "Failure Mode and Effect Analysis, FMEA from Theory to Execution"(ISBN 0-87389-300-X) but it is not as clearly stated.

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