BOM management educational webinar about part numbers, revisions, and interchangeability. You can learn about product structure data management, revision management, and change management

1. Interchangeable Parts
Revision or New Part Number?
Steve Hess
Director of User Experience, OpenBOM
stevehess@openbom.com
Wednesday October 2, 2019
© OpenBOM, 2018 (Newman Cloud Inc.)

2. This webinar is NOT a deep dive into part
number or BOM theory. I will suggest one path
forward at the end.
This is a “Marketing Free” event!
This webinar is 30 minute or less thoughtful
discussion about part number and revisions, and
how to incorporate them into BOMs.
© OpenBOM, 2018 (Newman Cloud Inc.)

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. Revision has
historically been applied to drawings but in the 3D CAD era often refer to the CAD
model as well. A Formal change. Typically assigned as Letters or Numbers
A Version is a rendition of a CAD design. A state the designer wishes to capture.
Informal.
© OpenBOM, 2018 (Newman Cloud Inc.)
Revision

4. D A - 1 0 0 0 3 2 - A
Revision
Part Number
Size
Type
Product Code
Intelligent Part Number
Part Number 1000
Prod Code Deck
Size 32
Type Assembly
Revision A
Purchased Yes
Non-Intelligent Part Numbervs.
We will use it for this
exercise.
The two types of Part Numbers methods (from Webinar #5)
© OpenBOM, 2019 (Newman Cloud Inc.)

5. 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!
In this example, our company is practicing F3.

6. Rev the bolt, rev the battleship? (RtBRtB)
RtB2 Is the thought process for evaluating how far up the assembly to record a change. Eg. If we Rev the
ladder of a battleship, do we rev the entire battleship? Of course not. But we need a thoughtful way of
determining how far up the assembly tree to go.
Rev A
Rev B

7. © OpenBOM, 2019 (Newman Cloud Inc.)

8. © OpenBOM, 2019 (Newman Cloud Inc.)
A typical BOM, 1005 Rev A reports to 1020 Rev A assembly

9. © OpenBOM, 2019 (Newman Cloud Inc.)
Per F3 the 1005 arms are interchangeable so NO part
number change. 1005 goes from A to B.
No change to 1020 upper level assembly. We do NOT rev
the upper assembly! Rev does NOT roll up.

10. © OpenBOM, 2019 (Newman Cloud Inc.)
The 1005 is no longer interchangeable so a new PN 1012
is assigned. Engineer decided that 1020 IS still
interchangeable so no PN change but roll Rev to B due to
1012 PN change.

11. Live demo...
Open Solidworks
Review the CAD models
Open Arm.sldprt
Show how 1005 Arm is built with configurations. PN is on the File and not configuration.
Open Arm-500.sldprt
Show part and PN
Show how to set configuration of Arm and use un/supress to switch to long arm-500
Open OpenBOM and review the Manufacturing and Planning Views
© OpenBOM, 2018 (Newman Cloud Inc.)

12. © OpenBOM, 2019 (Newman Cloud Inc.)
Closing thoughts about interchangeable parts in BOM
1) Life is easier with unintelligent (dumb) part numbers (just numbers) See Webinar #5
2) If you are using intelligent part numbers never store Rev or other state or phase info in the
part number
3) Use a BOM management tool like OpenBOM which associates and keeps data with part
number (a database, not Excel)
4) Use Form, Fit and Function as a design principal. Enforce it.
5) Decide who and how Revisions will be rolled up through the assembly structure and when
to stop. Revisions cost money, do not Rev the battleship! (RtB2)
6) Keep track of Rev in the planning BOMs so supply folks knows what to buy
7) Create a Manufacturing View of your BOM without Rev
8) Do NOT put Rev in the assembly BOM or on the drawing. With F3 parts are
interchangeable, if they are NOT, get a new part number. (we will cover BOMs on drawings
in more details in another webinar)

13. References
Wikipedia: https://en.wikipedia.org/wiki/Form,_fit_and_function
More about alternate parts:
https://medium.com/@openbom/how-you-can-define-alternate-and-substitute-items-in-openbom-67a912ff1730
Part numbering schemes (Arena): https://www.arenasolutions.com/resources/articles/part-numbering/
Part identification: http://beyondplm.com/2011/07/29/pdm-part-numbers-and-the-future-of-identification/
ASME Y14.35 Revision of drawings and related documents
https://www.asme.org/codes-standards/find-codes-standards/y14-35-revision-engineering-drawings-associated-documents
© OpenBOM, 2019 (Newman Cloud Inc.)

14. Questions?
Please type into the webinar panel or send to support@openbom.com
More information at www.openbom.com
© OpenBOM, 2018 (Newman Cloud Inc.)