The three DfM strategies
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Question
What are the three DfM strategies?
Answer
Design for process — does the shape suit the way it is made? Design for assembly — how many parts and how do they go together? Design for disassembly — can it come apart?
Question
Why must DfM happen before tooling?
Answer
Every DfM change is a change to the drawing. Once the tool is cut the same improvement costs a new tool.
Question
How do assembly and disassembly conflict?
Answer
Assembly wants snap-fits, adhesive and the fewest parts; disassembly wants screws, one fastener type and separable materials.
Question
What resolves that conflict?
Answer
A released snap-fit a tool can open at a named point, or screws where the product must be opened and clips where it need not be.
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Topic 12.1 hub
Design for manufacture
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Design Technology exam skills
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