I thought I had a good understanding of DFMEA, however I recently got my hands on some ASQ training, and I am seeing something that I don't agree with/understand.
They start by saying a primary assumption of DFMEA is that the part is produced to specification (which I agree with). However, the ASQ training shows a single line item example of DFMEA where it is essentially:
Monitoring Bracket fails to support motor ---> leading to bracket breaks and motor slides out of harness ---> caused by material out of spec.... Detection controls are "Random manual spot check material inspection", and as a result of a high RPN, a possible new Detection action is "Select new supplier that can certify all received brackets are in line with spec"
To me this whole line is essentially for PFMEA. It does not get into the design related causes of the failure, it is strictly related to a supplier not being able to meet the print. To use the same example, I would think it'd be more appropriate if the cause were something like "Material design inadequate to withstand application", and the detection controls would be something like specific testing (design testing, not routine incoming inspcetion) done to determine whether the correct material specifications were chosen...
Based on this, I'm thinking it likely that this is just an error with the training, and they meant to say this was for PFMEA? (this is not uncommon that these sorts of trainings are not well-reviewed in my experience-- I saw some RAPS training content that was blatantly contradictory/clearly not what was intended. Any input is much appreciated!
They start by saying a primary assumption of DFMEA is that the part is produced to specification (which I agree with). However, the ASQ training shows a single line item example of DFMEA where it is essentially:
Monitoring Bracket fails to support motor ---> leading to bracket breaks and motor slides out of harness ---> caused by material out of spec.... Detection controls are "Random manual spot check material inspection", and as a result of a high RPN, a possible new Detection action is "Select new supplier that can certify all received brackets are in line with spec"
To me this whole line is essentially for PFMEA. It does not get into the design related causes of the failure, it is strictly related to a supplier not being able to meet the print. To use the same example, I would think it'd be more appropriate if the cause were something like "Material design inadequate to withstand application", and the detection controls would be something like specific testing (design testing, not routine incoming inspcetion) done to determine whether the correct material specifications were chosen...
Based on this, I'm thinking it likely that this is just an error with the training, and they meant to say this was for PFMEA? (this is not uncommon that these sorts of trainings are not well-reviewed in my experience-- I saw some RAPS training content that was blatantly contradictory/clearly not what was intended. Any input is much appreciated!