There are no set rules in the DfA practice, however, there are some criteria you can use when trying to decide whether or not your design qualifies:
- Parts need to be simple enough where they cannot be easily assembled by hand; i.e., screws need to be self-tapping (no pre-tapped holes), joints need to be over-designed, parts need at least one flat surface to provide a "key" etc.
- Features must be designed so that they do not require any additional tooling which can increase manufacturing costs (e.g., holes requiring custom tools, screws needing custom taps)
- Minimum tolerances need to reflect the tightest tolerances in your product design.
- The assembly needs to be able to be completed without any errors
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