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  FMEA and Control Plans
  FMEA Part III

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Author Topic:   FMEA Part III
Al Dyer
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Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 13 May 2001 06:05 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
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MSAFAI
Forum Contributor

Posts: 24
From:Tehran - IRAN
Registered: May 2001

posted 13 May 2001 07:14 PM     Click Here to See the Profile for MSAFAI   Click Here to Email MSAFAI     Edit/Delete Message   Reply w/Quote
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,
MSAFAI

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Ibrahm
Lurker (<10 Posts)

Posts: 4
From:Jakarta, Jakarta, Indonesia
Registered: May 2001

posted 14 May 2001 01:03 AM     Click Here to See the Profile for Ibrahm   Click Here to Email Ibrahm     Edit/Delete Message   Reply w/Quote
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?

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MSAFAI
Forum Contributor

Posts: 24
From:Tehran - IRAN
Registered: May 2001

posted 14 May 2001 02:48 AM     Click Here to See the Profile for MSAFAI   Click Here to Email MSAFAI     Edit/Delete Message   Reply w/Quote
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,
MSAFAI

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

posted 14 May 2001 06:12 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
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...

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Ibrahm
Lurker (<10 Posts)

Posts: 4
From:Jakarta, Jakarta, Indonesia
Registered: May 2001

posted 15 May 2001 08:47 PM     Click Here to See the Profile for Ibrahm   Click Here to Email Ibrahm     Edit/Delete Message   Reply w/Quote
Thank you guys. Those makes me think about some ideas.

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