How to create robustness checklist from p diagram

oceyuboglu · Feb 13, 2019

Hi everyone,

I m recently working on dFMEA for ac lines and I completed all the p-diagrams. Now I need to continue on the robustness checklist. But the links on the file are not working and I need your support to understand how to create rcl from p diagram.

Anyone experienced in this? Thanks.

Miner · Feb 14, 2019

Can you share an example of a robustness checklist? This sounds like something unique to your company or sector.

oceyuboglu · Feb 14, 2019

I attached the example template. It s to ensure you cover all the noise factors in design and validation. Anyone have an experience in RCLs?

Miner · Feb 14, 2019

Attached is an example of a completed matrix and P-diagram from the Ford FMEA manual. This is the best I can do. If you are a Ford supplier you can access this here.

How to create robustness checklist from p diagram

Jimmy123 · Mar 6, 2019

I can not understand customer usage and piece to piece variation. Seems an unique idea from Ford. I see only 3 categories of noises P-Diagram

Miner · Mar 7, 2019

What kind of products/services do you support? That would help us to provide relevant examples.

Customer usage means the use to which the many varied customers will use the product. In the car example, Hertz would use it for fleet rentals. I would use it for mostly short duration highway driving. Another home healthcare professional would use it for many short duration city trips in stop and go traffic. The differences in this usage has a major impact on the vehicle.

Piece to piece variation includes the variation within the design tolerances and all component variation seen from the suppliers as well as all assembly variation seen in manufacturing. Again, this variation impacts the final product's performance and life.

Jimmy123 · Mar 7, 2019

Miner said:
What kind of products/services do you support? That would help us to provide relevant examples.

Customer usage means the use to which the many varied customers will use the product. In the car example, Hertz would use it for fleet rentals. I would use it for mostly short duration highway driving. Another home healthcare professional would use it for many short duration city trips in stop and go traffic. The differences in this usage has a major impact on the vehicle.

Piece to piece variation includes the variation within the design tolerances and all component variation seen from the suppliers as well as all assembly variation seen in manufacturing. Again, this variation impacts the final product's performance and life.

For PtP, variation comes from tolerances and tolerance is a control factor, isnˋt it? So therefore itˋs double. For Noise factors I like more the classical view from Taguchi, outer, inner and manufacturing disturbances : https://pdfs.semanticscholar.org/d024/332d0dec884cd940843890393f9d1dae5614.pdf

Miner · Mar 7, 2019

The nominal value is a control factor. The tolerances allow variation, which is noise.

Figure 2 noise factors are almost identical to the P-diagram noise factors.

Jimmy123 · Mar 9, 2019

Miner said:
The nominal value is a control factor. The tolerances allow variation, which is noise.

Figure 2 noise factors are almost identical to the P-diagram noise factors.

I disagree, sorry. The engineer defines the tolerance, therefore this is under control. The variation comes maybe from the process or over time in use. But not in a design P-Diagram. In my understanding this is not logically.

Jimmy123 · Nov 10, 2019

Miner said:
What kind of products/services do you support? That would help us to provide relevant examples.

Customer usage means the use to which the many varied customers will use the product. In the car example, Hertz would use it for fleet rentals. I would use it for mostly short duration highway driving. Another home healthcare professional would use it for many short duration city trips in stop and go traffic. The differences in this usage has a major impact on the vehicle.

Piece to piece variation includes the variation within the design tolerances and all component variation seen from the suppliers as well as all assembly variation seen in manufacturing. Again, this variation impacts the final product's performance and life.

can we say external noise is external condition and load to the product?

How to create robustness checklist from p diagram

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