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WEBINAR: BOMs on Drawings - Still Relevant or Old School?


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BOM Management Educational Webinar #7 is about BOM on Drawings - a topic that ALWAYS raises many questions, opinions, and debates

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WEBINAR: BOMs on Drawings - Still Relevant or Old School?

  1. 1. BOMs on Drawings Still Relevant or Old School Steve Hess Director of User Experience, OpenBOM Wednesday October 16, 2019 © OpenBOM, 2018 (Newman Cloud Inc.)
  2. 2. This webinar is NOT a deep dive into ERP or BOM theory. I will suggest a path forward at the end as an option for you to further investigate. This is a “Marketing Free” event! This webinar is 30 minute or less thoughtful discussion about the age old practice of putting BOMs on drawings. Is it still relevant or is there a better way? © OpenBOM, 2018 (Newman Cloud Inc.)
  3. 3. Definitions: (typical) A Part Number is an unambiguous identifier of a particular part design. Its purpose is to simplify reference to that part. A Revision is a change which typically requires a new drawing. A Drawing is a 2 dimension wireframe representation of some 3D part(s). Usually following some standard and include dimensions and other manufacturing information. A bill of materials is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts, and the quantities of each needed to manufacture an end product. © OpenBOM, 2018 (Newman Cloud Inc.)
  4. 4. Classic assembly drawing with BOM. Parts have “Revision” Drawing has “Revision” Likely a PDF In this example, our company is NOT following Form, Fit and Function (F3) because they have part “Revision” in the BOM. Check out Webinar #6 for more details on F3. © OpenBOM, 2018 (Newman Cloud Inc.)
  5. 5. Pros of BOM on Drawing: - Ease of use - My MFG dept always gets all the information - My CAD tool may do this automatically - BOM usually matches the drawing - BOM is automatically rev controlled with the assy drawing - Single Document © OpenBOM, 2018 (Newman Cloud Inc.)
  6. 6. Cons of BOM on drawing: - MUST roll rev on DWG when BOM changes! - Simple part rev forces me to update assy drawing (non-F3) - Add grease, must roll assy dwg rev - Assy dwg rev is costly - Higher rev parts are more costly from suppliers - No opportunity to input into other business systems, BOM on drawing is dead (PDF) data. - BOM is not portable, eg. must have drawing to see BOM - No history of changes © OpenBOM, 2018 (Newman Cloud Inc.)
  7. 7. © OpenBOM, 2019 (Newman Cloud Inc.) What are the alternatives? (a proposal) - DON'T PUT BOM ON DRAWING - Replace the BOM on the drawing with a “Parts List” - Balloon to the Parts List for part identification - Create a controlled BOM as a separate entity (still linked to CAD) - Refer to the BOM by its own Part Number, perhaps as a dash number of the Assy Dwg - The controlled BOM is the “Bill of Materials” - Share the BOM with the manufacturing dept or sub-contractor as you would any other design document or perhaps take advantage of cloud sharing - Maintain and revision the BOM separate from the Assy Dwg
  8. 8. © OpenBOM, 2019 (Newman Cloud Inc.)
  9. 9. © OpenBOM, 2019 (Newman Cloud Inc.) How do I do that?
  10. 10. Live demo... Open the ELM DWG W/O BOM tab and review Open the OpenBOM tab Save as Rev A Export to PDF - can be emailed or printed and added to shop traveler Share it with the supplier Add Grease to BOM Create Rev B Export to PDF with changes No changes needed to the Drawing View the History © OpenBOM, 2018 (Newman Cloud Inc.)
  11. 11. © OpenBOM, 2019 (Newman Cloud Inc.) Closing thoughts BOMs and Drawings 1) If you are currently putting BOMs on drawing consider going to F3, it will reduce the number of assembly drawing revisions needed 2) Consider making the leap to a seperate managed BOM so you can maintain, share, track and control individually 3) Uncouple BOM changes from assembly drawing revisions will reduce ECOs and save money 4) Make your BOMs full citizens…… Revisions, Sharing, History, Where used, Multi-Level, reuse…… on and on 5) FInally, you can get out of the CAD/BOM/Template mess
  12. 12. References 7 Seconds of advice about BOMs on Drawings: Forum discussion of BOMs and item numbers on drawings: A short wiki on Form, Fit and FUnction:,_fit_and_function OpenBOM Webinar #6 - Form, Fit and Function OpenBOM Youtube Webinar Playlist © OpenBOM, 2019 (Newman Cloud Inc.)
  13. 13. Form, Fit and Function Form, Fit and Function is the identification and description of characteristics of a part or assembly. The F3 framework increases design change flexibility by allowing changes to the part with minimal documentation and design cost as long as the form, fit and function of the product are maintained. If your company is using F3 you can think about it like this….. “I can have a box of parts, some Rev A, some Rev B, etc…. When I reach in to get one to use on an assembly, it doesn’t matter which one I grab” → All Revisions of a part are completely interchangeable!
  14. 14. Questions? Please type into the webinar panel or send to More information at © OpenBOM, 2018 (Newman Cloud Inc.)