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A bill of materials looks like a simple table, but a poor BOM can create purchasing mistakes, missing parts and assembly delays. A good mechanical design BOM should help another person build the product without guessing.
Start With Clear Part Numbers
Every manufactured and purchased component should have a consistent identifier. Avoid using vague names such as “bracket new” or “plate final”.
Descriptions Matter
Use descriptions that distinguish similar parts. Include size, material, finish or standard information when those details are important.
Separate Purchased and Manufactured Items
Bolts, bearings, motors and standard hardware may need different information from fabricated components. Make the BOM useful for procurement as well as production.
Revision Control
A BOM must match the drawing and CAD revision. If the drawing changes but the BOM does not, production can easily build the wrong configuration.
CAD Automation
Modern CAD systems can populate BOM information from model properties. This is powerful, but only if the properties are maintained consistently.
Simple Rule
If a new engineer can open the BOM and understand what needs to be purchased, manufactured and assembled, the BOM is doing its job.
Keep learning: Explore more practical engineering articles in the GetCADFile Design Guide.