Tag Archives: fabrication

Bunnie’s Factory Tour Part 1: How To Make A BOM

Bunnie Huang posted an extensive explanation of how you’re doing your Bill Of Materials (BOM) all wrong. Here’s a taste. For the whole 5-course meal head over to his blog.

Most Makers trying to scale up quickly realize the only practical path forward is to outsource production.

Every single assumption, down to the color of the soldermask, has to be spelled out unambiguously for a third party to faithfully reproduce a design. Missing or incomplete documentation is the lead cause of production delays, defects, and cost overruns.

Here’s some of the things missing from the [typical] BOM:

  • Approved manufacturer for each component
  • Tolerance, material composition, and voltage spec for passive components
  • Package type information for all parts
  • Extended part numbers specific to each manufacturer

A complete BOM for an LED flasher also needs to include the PCB, battery, plastic case pieces, lens, screws, any labeling (for example, a serial number), a manual, and packaging (plastic bag plus cardboard box, for example). There may also need to be a master carton as a single boxed LED flasher is too small to ship on its own.

 

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Printable Folding Construction Demonstrated With Robots

Sometimes you just can’t get from where you are, to where you want to be, in one step. For example, open hardware tends to work with stock materials, which means flat sheet is popular. It’s usually cheaper to obtain and work than a large block of the same material. But there aren’t very many ways to use a flat sheet if it stays a flat sheet. A couple popular ways to fold a flat sheet into a useful volume are illustrated.

Folding box by YanaPonoko. Thingiverse #17659

Parametric Flex Box by Juerd. Thingiverse #17327

Can this folding idea be taken even farther? For example, can we fold flat surfaces not just into structures, but into mechanisms as well?

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