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This thread is carried over and continued in the Current Elsmar Cove Forums |
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This thread is carried over and continued in the Current Elsmar Cove Forums |
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 The Old Elsmar Cove Forums
 FMEA and Control Plans
 FMEA Part III
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| Author | Topic: FMEA Part III |
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Al Dyer Forum Wizard Posts: 622 |
posted 13 May 2001 06:05 PM
   
Continued From: http://Elsmar.com/ubb/Forum12/HTML/000070.html IP: Logged |
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MSAFAI Forum Contributor Posts: 24 |
posted 13 May 2001 07:14 PM
Dear Al, I think there was a misunderstanding. I was only talking about D-ranking table. I meant it can refer to the ability of a control method to detect a 'failure mode' or a 'cause'. (type 2 and 3 controls) Regards, IP: Logged |
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Ibrahm Lurker (<10 Posts) Posts: 4 |
posted 14 May 2001 01:03 AM
For MSAFAI and All Dyer, thank you for the reply. Maybe I need to explain my case more clearly. There is one failure mode, just say the wire color is red (I work in cable industry), the potential cause is too high temperature of annealing. S = 8, O = 6. There are two Current process control in practice: check temperature 1 time per shift, and inspect 100 % of the product. To find D: If I use the first current control, D will be 5, so RPN = 240. Need action (I use RPN 100 as a limit) If I use the second one, D will be 2, so RPN = 96. No need action. What should I choose? In my opinion, I should lead my process to be failure preventive. So 100 % product inspection should be avoided. But according to the manual,that states that we can use type 2 of 3, It seems that we can choose the number of RPN. We want to high, use the second approach (in my case above). We want to low, use the first one. Am I correct? IP: Logged |
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MSAFAI Forum Contributor Posts: 24 |
posted 14 May 2001 02:48 AM
Dear Ibrahm, I think there are two methods to use: 1- Give a D number for the TOTAL control system (cause + failure detection) 2- Use the lowest D number.(this is what I prefer) Colleagues, please comment which approach is better? regards, IP: Logged |
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Al Dyer Forum Wizard Posts: 622 |
posted 14 May 2001 06:12 PM
If there are multiple process controls for a given cause, each of those controls should have its own detection ranking. Under failure mode "xyz" I could have two separate causes. I could have cause "A" that is controlled by 3 different controls. Each of those controls would need a separate detection ranking. Cause "B" is controlled by 1 control method and would require 1 detection ranking. I guess this all leads to the fact that we can have 1 failure mode that has multiple causes, controls, and RPN's. As with all FMEA's, there is room for discretionary use with the knowledge that we need to be able to back up our reasoning for using whatever ranking systems we develop. The ranking systems in the AIAG are only guidelines as long as we keep it as consistant as possible. ASD... IP: Logged |
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Ibrahm Lurker (<10 Posts) Posts: 4 |
posted 15 May 2001 08:47 PM
Thank you guys. Those makes me think about some ideas. IP: Logged |
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