VBOM

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Protocol

HintLightbulb.png Hint:

  1. Document on the wiki under MachineName_vBOM
  2. Use Presentation Template for the working document
  3. Title your page in a descriptive way using MachineName vBOM in the title. Include pictures, and hyperlink them to the actual part online
  4. Put a blue border around items that are hyperlinked to note that they are hyperlinked
  5. List all parts with final part count
  6. See below for an example

Intro

The vBOM is a visual BOM (Bill of Materials). It includes parts that reflect the geometrical representation of an artifact as closely as possible. The vBOM takes much more effort to create than a BOM listing.

Going through the creation of a complete vBOM prior to building ensures that one accounts for all the parts - no parts missing or excess parts when buying materials.

The usefulness of a visual BOM lies mostly in the buildability of an artifact. Ideally, the CAD in an assembly is downloaded from various part libraries from suppliers. This assures that the CAD is accurate and sourcable - therefore buildable. In design, when working with off-the-shelf parts - it is easy to run into errors when inaccurate part CAD is used. That can be a difference between parts fitting together in the real build - vs not. The CAD Trap occurs when you everything is good in the design, but parts don't fit in real life.

To automate creation of Visual BOMs - a FreeCAD Visual BOM module would need to be created to add hyperlinks to designs. Sourcing links would need to be added to the parts as metadata. The Visual BOM module would also have the functionality of creating a complete BOM that can be used readily for sourcing, in the form of a printable spreadsheet.

Requirements

  • Every single part of the hardware being developed must be shown
  • Every part has a direct link to that part's sourcing, such as an online store
  • Link can be a text link or image link. If image link, make the outer image line blue to indicate that there is a link, as this is not visible just by looking at the picture.
  • BOM and vBOM must be reconciled - the parts should match.
  • BOM contains additional information. vBOM focuses on graphical representation for quick study of hardware make-up.
  • A vBOM serves as a foundation for an Exploded Part Diagram and Exploded Part Animation in FreeCAD

Example

Plumbing

Note: parts with blue border are hyperlinked. Complete BOM and required numbers of parts, as well as parts completeness, can be obtained from this diagram.

Hydraulics

Example showing every single part. Each part should be hyperlinked. Make it so if it isn't.

[edit

Advantages

  • Method provides a self-verifiable transparancy when sourcing parts, so that when you are at a store, you can tell more easily if you missed something.
  • If using editable docs, these can be updated on a continuing basis.
  • They provide a direct connection between a design and its component parts. Analysis of a vBOM can inform one readily whether a part is missing from a design.

Disadvantages

  • vBOMs take more effort to produce

Links