Hardware Reference
In-Depth Information
Table 13.2 BOM for Production a
It is not unusual for a manufacturer to make substitutions for parts specified in the
BOM. Sometimes this is done because the manufacturer can get substitute parts at a lower
cost than what you've priced out, or sometimes the manufacturer might not have access to
large enough quantities of the components you used in your prototype. This is where a
highly detailed BOM becomes very important. The more detail you add to the BOM, the
more likely the manufacturer will be to find a suitable replacement part.
The file requirements for the mechanical parts of your products are similar to the elec-
tronics parts, but there are a few key differences. One interesting difference that while
PCB manufacturers expect Gerber files, you will not be asked to provide the mechanical
equivalent, “G-Code,” to a machine shop. In the mechanical world, several file formats
are commonly used that allow for easy exchange of design files—namely, DXF, IGES,
STEP, and STL. DXF is a file format created by Autodesk for use with its software. Most
non-Autodesk software typically include import/export capability for DXF files. This is a
common way to send two-dimensional objects data that might be fabricated by a laser cut-
ter, water-jet cutter, or router. IGES is an open file format created by the U.S. Air Force to
simplify the exchange of information between design and manufacturing. 1 STEP (ISO 10303)
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