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AIAG FMEA 4th Ed "Design Assumption" - I Need Examples

C

Carmine

#1
I'd like to have some pratical examples based on your experince about this FMEA assumption:

"The team should also assume that the design of the product is correct; however, if there are
design issues which result in process concerns, those issues
should be communicated to the design team".

Thanks
 

Jim Wynne

Staff member
Admin
#2
I'd like to have some pratical examples based on your experince about this FMEA assumption:

"The team should also assume that the design of the product is correct; however, if there are
design issues which result in process concerns, those issues
should be communicated to the design team".

Thanks
This is similar to the Process FMEA assumption that material/product entering and operation is in conformance with requirements. The rationale is that the FMEA focus is supposed to be on the operation at hand, and that the previous operations have already been addressed.

For the DFMEA process, the design is assumed to be correct so that the DFMEA team can concentrate on potential failure modes and not have to redesign the product. As the text you quoted suggests, the team should still be aware that things might not all be what they should, however.
 

Miner

Forum Moderator
Staff member
Admin
#3
Good examples of this assumption include:
  • A die casting designed without a draft angle to allow release from the die
  • A fastener location that cannot be correctly torqued because there is insufficient tool access
  • Tolerances specified that cannot be met by current technology
 

Jim Wynne

Staff member
Admin
#4
I'd like to have some pratical examples based on your experince about this FMEA assumption:

"The team should also assume that the design of the product is correct; however, if there are
design issues which result in process concerns, those issues
should be communicated to the design team".

Thanks

Good examples of this assumption include:
  • A die casting designed without a draft angle to allow release from the die
  • A fastener location that cannot be correctly torqued because there is insufficient tool access
  • Tolerances specified that cannot be met by current technology
These aren't examples of the assumption; they're counter-examples--things that might contradict the assumption.
 
C

Carmine

#5
Thanks for examples. I was reffering to the second assumption in PFMEA

"The team should also assume that the design of the product is correct; however, if there are
design issues which result in process concerns, those issues
should be communicated to the design team".

In this case is the Process Team to take this assumption.
 

Jim Wynne

Staff member
Admin
#6
Thanks for examples. I was reffering to the second assumption in PFMEA

"The team should also assume that the design of the product is correct; however, if there are
design issues which result in process concerns, those issues
should be communicated to the design team".

In this case is the Process Team to take this assumption.
I think you mean that Miner's examples are what you were looking for? There's only one assumption in your quoted text--that the team should assume that the design is correct.
 

Jim Wynne

Staff member
Admin
#8
Explain me your point giving some examples. So I can compare.
I'm not sure what you're asking for. The assumption is that the DFMEA team should consider the design to be correct. That assumption might be contradicted by observations (such as Miner pointed out), in which case the DFMEA team should inform the design team (if in fact they are different entities) of what they found.
 
C

Carmine

#9
I think that assuming that the design is correct It means that I don't have to consider the possibility of having a wrong design, so I don't have to consider Design Failure mode but just Preocess ones. AmI wrong?
 
C

Carmine

#10
I think that assuming that the design is correct It means that I don't have to Process Failure mode coming from a wrong design. But actually I they can be as Miner suggestin his examples. Do you agree?
 
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