Design for Assembly in DFMEA - Failure Effect of Sub-System(s)

Cephissus

Starting to get Involved
#1
Hello all,

Another recurring problem that I am facing

For System A to work, it needs Sub-Systems A.1 and A.2 to be assembled together.

In general, a failure of Sub-System A.1 or Sub-System A.2 will lead to a failure of System A.

What happens when a Design failure of Sub-System A.1 will mean that it cannot be assembled to Sub-System A.2 ?? As such System A can't even exist and therefore the discussion about its functions and failures become irrelevant?

How would you describe the Failure Effect of Sub-System A.1 can't be assembled? And how would you rate it in terms of Severity?
 

Miner

Forum Moderator
Staff member
Admin
#2
From your description, you would focus on the severity of the impact to your assembly process. Not knowing your process, we cannot state a specific value. In some processes this severity would be minimal, while in others, it could be pretty severe, resulting in downtime due to the unavailability of parts. I highly doubt that it would be a 9 or 10 as that would mean a process safety issue.
 

Miner

Forum Moderator
Staff member
Admin
#4
If the PFMEA tables take the impact on your process into account, then yes. The usual tables are often very generic and externally focused.
 

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