BOM tables on 2D production drawings
Hello
I would like to start a discussion to see what type of practices are out there regarding the so called BOM table on the 2D production drawings.
Let me explain the context first and my understanding so far.
The design is first created in 3D and this CAD structure is technically the eBOM. You can assemble the model in many different ways, sometimes with tools that allow you to generate the model very quickly. Therefore at that stage you should not be concerned about how this will be made.
However, when you create the 2D drawing and insert the BOM table, that table, despite a few options, will create the BOM from the CAD structure.
Now imagine that this model is made at different factory (or even the same one but with different assembly machines (for sake of argument, one machine just need the components and it assembles the part, another one is semi automated and needs sub assembly first).
Either manufacturing process produces exactly the same assembly.
I think we all agree that for one unique partnumber you should have only one eBOM and therefore only one CAD asm file.
This leads to the situation that the BOM table on your 2D drawing cannot be the mBOM, because if it is, then what do you do for the other mBOM due to a different manufacturing process.
To me the mBOM should never be put on the 2D drawings. There should be a list of component maybe but the work instruction and mBOM should only comes to the shopfloor from the ERP system.
However,in my company some insist to have the BOM table on the 2D drawing to be the mBOM as they will make the part.
And as a consequence they model their CAD structure to be like their mBOM and that generates automatically the BOM table as a mBOM.
When I ask them if they will create a new model (leading to duplication and anyway PDMLink or ERP won't tell them create 2 different objects with the same number) when the manufacturing process is changed. I get no answer.
Have you faced such situation where production engineer wants their mBOM on the 2D drawings
Do you think it is good/idea practice ?
Of course one alternative is to manually create the BOM on the 2D drawing but this has also disadvantages.
To be the solution is simple. people who need to assembly the product must get the work instructions and mBOM from the ERP system. The drawings is only to make them understand how the product look like and which dimensions matters etc....
What is your view.
Thanks and best regards