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GraemeMarwick1-Visitor
1-Visitor
May 4, 2011
Question

Functional Description of a part or assembly

  • May 4, 2011
  • 1 reply
  • 3789 views

Is it possible to create a functional description of a part or assembly in a model that is carried through to a multi-level BOM that can be exported to an Excel file?

For example; I want to functionally identify a "Right Front Wheel Assembly" as being different from a "Left Rear Wheel Assembly" but they have the same part number.

1 reply

K
KonstantinSount1-Visitor
1-Visitor
May 6, 2011

Hi Graeme,

Please consider the following.

What does it mean ‘the same’ object and ‘the same’ functionality. Having the same four wheels promises a smooth rotation, but not the same functionality – the rear wheels may not be balanced.

BOM usually shows the quantity (four) for the same dependent, and to show the user defined dependency attribute (which one?) is a challenge.

Think about changing the design a little bit – introduce a family table. The generic could have the Description attribute “wheel assembly”, and four instances will have a table-driven Description attribute saying “front left”, “front right”, and so on. You may have even a Color attribute for every wheel. Now change the generic dependent by its instances.

The drawback would be that instances have own part/assembly number and BOM will show them in separate rows.

G
GraemeMarwick1-VisitorAuthor
1-Visitor
May 10, 2011

Hi Konstantin,

Thanks for your response.

The issue is more fundamental than the possibility of the rear wheels being in or out of balance.

If one designs a vehicle that has three wheels the same and one odd one (hypothetical case, because I would not design such a vehicle) it would be nice to be able to automatically extract from the ProE model information as in the “table” below:-

Functional Description Part Name Part Number Quantity

Right Front wheel 15” Wheel Assy WHL15-230 1

Left Front Wheel 15” Wheel Assy WHL15-230 1

Right Rear Wheel 15” Wheel Assy WHL15-230 1

Left Rear Wheel 14” Wheel Assy WHL14-210 1

As far as I have been able to establish from the clever ones (I am not one of those – I aspire to automating the project management process based on the modelled products) in our organisation, ProE will automatically change the contents of the “Functional Description” column to the last entry made in such a column for all the components that have the same Part Number and one ends up with following fairly useless information:-

Functional Description Part Name Part Number Quantity

Right Rear Wheel 15” Wheel Assy WHL15-230 3

Left Rear Wheel 14” Wheel Assy WHL14-210 1

Now, I ask you, which is more useful to the people who have to assemble the vehicle – I would have thought the first.

From the first table one can extract the following information:-

Purchase Dept to buy:-

Part Name Part Number Quantity

15” Wheel Assy WHL15-230 3

14” Wheel Assy WHL14-210 1

Assembly group, assemble vehicle like this:-

Functional Description Part Name Part Number

Right Front wheel 15” Wheel Assy WHL15-230

Left Front Wheel 15” Wheel Assy WHL15-230

Right Rear Wheel 15” Wheel Assy WHL15-230

Left Rear Wheel 14” Wheel Assy WHL14-210

One cannot do that from the second table and some of the design intent is lost. With us, it causes huge problems in delays and errors.

On reflection one only needs to have this kind of identification at any assembly level; parts only need to be named, not functionally described.

This whole issue is not about design technique but about automating the transfer of information or design intent for other purposes such as Product Orientated Project Management, Assembly, Manufacturability, Maintainability etc, etc.

From what I have been able to find out none of the CAD design packages allow one to do what is shown in the first table, maybe you can direct me to somewhere with whom I could address this problem.

Once again, thank you for your response and I look forward to further discussion.

Regards,

Graeme.

K
KonstantinSount1-Visitor
1-Visitor
May 11, 2011

Hi Graeme,

Windchill ProductPoint doesn’t have such functionality.

PDMLink (Windchill) has an ability to customize the BOM adding the user-defined attributes to the relations (or reference designators) and then it can group by them in addition to the part name.

I was trying to find solution using Pro/ENGINEER. It doesn’t work as expected. I do understand the difference between ‘model attribute’ and ‘relation attribute’ (the same model can have different functional descriptions in different assemblies).

I’m sorry if I brought rather confusions than answers.

Regards,

Konstantin.

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