DFMEA is a Design FMEA performed on the product design PFMEA is a Process FMEA performed on the manufacturing process. Both are very useful and both techniques should be utilized. There is correlation between the two – one analysis could definitely influence the other, and often times a mitigation for a Design FMEA may be doing something different in the manufacturing process if it cannot be fixed by design alone. There are many other forms of FMEA such as User FMEA, Software FMEA, Functional FMEA and others. FMEA is a very powerful tool and you choose the type of FMEA based on the particular circumstance. Here is a short summary of my favorite 6 types: DESIGN FMEA Design FMEAs are performed on the product or system at the design level. The purpose is to analyze how failure modes …
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Questions for our Experts
If you have a question, you can comment to this post. …
ORT Programs
Here is a question that came in from Jason Li on ORT. If the product/component is qualified through initial qualification, then, the product design and the manufacture process is qualified. The activity after product launch is to ensure the manufacturing process is under the control through the necessary quality activities such as SPC. There is no reason to believe that the reliability performance would be changed if the process is under control. At least, a good process control practice will cover the majority of the reliability issues/concerns. Jason's argument is how can we justify the value add on implementing ORT program in addition to the implementation of the supplier quality system? …
Electromechanical Predictions
Below is a question from Paul Paroff asking: "how to deal with these electromechanical components that do not have published MTBF values but do have rated life values in an MTBF prediction?" …
Reliability – Best Practices
At one time or another all of us have been the "new" reliability engineer on the block. You have been given a set of expectations from your boss to either ensure that your product is 1)"good enough" and ready for production or 2) will meet the expected "reliability". So as the "newly" minted reliability engineer where do you start? In this blog we will discuss tools/best practices for the "new or seasoned" reliability guru to guide you on your journey. So, to get things started just what exactly is reliability engineering anyway? One definition is as follows: Reliability engineering is the function of analyzing the expected or actual reliability of a product, process or service, and identifying actions to reduce failures or mitigate their effect. In addition to this definition, …
