me_350_-_lect_20_-_dfa_part_2.20091104.4af252a94455b7.32073861

Me_350_-_lect_20_-_dfa_part_2.20091104.4af252a94455b7.32073861

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ME 350 – Lecture 20 – DFA Part 2 Part Principles DFA Part Analysis Determining Assembly Efficiency Examples of Improving Part Design
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‘Part’ DFA - Principle #1 Components should be symmetrical or have exaggerated asymmetry Symmetrical shapes have a predictable rest aspect Non-symmetrical shapes have an unpredictable resting aspect With exaggerated asymmetry part falls on one of its flat faces
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‘Part’ DFA - Principle #2 Components should have the least number of important directions Increases the probability of correct feeding and positioning B A B A
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‘Part’ DFA - Principle #3 Provide Lead-in or Chamfers Where possible make chamfers and lead-in angles generous, and avoid sharp corners, to avoid jamming: OR
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‘Part’ DFA - Principle #4 Design parts to prevent tangling: Often a small design change can eliminate the tendency of components to tangle. Close ends and keep material thickness greater than gaps and slots:
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Me_350_-_lect_20_-_dfa_part_2.20091104.4af252a94455b7.32073861

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