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Flip to reveal answersWhy are mechanisms chained rather than combined into one part?
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All 4 Flashcards — Combining motions
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Question
Why are mechanisms chained rather than combined into one part?
Answer
Because each mechanism changes one thing. Chaining gives cheap standard parts, faults traceable to one stage, and ratios changeable by swapping a single component.
Question
What does chaining mechanisms cost?
Answer
Efficiency, free play and wear. Efficiencies multiply: five stages at 95% each deliver about 77% of the input.
Question
How should a mechanism chain be analysed?
Answer
Write the motion at each junction first, then name the mechanism that converts each pair. One stage at a time: motion in, motion out, reason.
Question
Name the five mechanisms in a sewing machine and what each does.
Answer
Belt — reduces motor speed. Gears — synchronise the two shafts. Crank — rotary into reciprocating for the needle. Cam — times the fabric feed. Linkage — clamps the presser foot.
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Topic 3.3 hub
Mechanical systems
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