Example of a P-Diagram for Process FMEA - Uncontrollable noises

S

Sleepy Cat

Registered
If I create PFMEA with 6M, I don't know how to write the following items for "Method".
Step2 Process Step - Process Work Element
Step3 Function of the Process Step / Product Characteristic - Function of the Process Work Element / Process Characteristic
Step4 Failure Mode (FM) of the Process Step - Failure Cause (FC) of the Work Element
For example, is the following correct?
Step2 Mixing - Stirring speed according to the work instruction
Step3 Uniform agitation - the work instruction instructs the procedure to achieve uniform stirring
Step4 Uneven mixing - Incorrect or insufficient instructions, damaged or dirty, not near the operator
 
Bev D

Bev D

Heretical Statistician
Leader
Super Moderator
Sleepy Cat: Have you had any formal training on PFMEA? Are you working on this alone or with a trained team? I ask because your example is a “hot mess” and I don’t say this to be mean but to be clear that this example is not how a PFMEA is intended to be.

The basic method of FMEA is to:
1. List the functions of the process (not ‘steps’ in a process)
2. List the failure modes of the functions (full failure, partial failure, intermittent failure and/or unexpected failure as appropriate)
3. List the Effects of each failure mode.
4. List the potential causes of each failure mode.
The ‘6Ms’ (Man, Machine, Method, Measurement, etc) is helpful in thinking about causes of failures but it is not required or even appropriate to always list causes in all categories

So, “uneven mixing” is not a step, it is a failure mode of mixing. Now think about what the effect of uneven mixing is. How severe is uneven mixing? Next think about how uneven mixing can occur. This is often a multi step thing (like dominoes in a line falling). For example uneven mixing can occur because the mixing time is too short; how can the mixing time be too short? Then you need to think about how you might prevent, detect or mitigate uneven mixing…

FMEA is not a form you fill out. It is a guide to developing robust processes (and designs).
FMEA is complex and requires substantial training, coaching and experience.
 
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