Mon Prof Augmenté
A bird that rises with a crank
Age 10 · Crafts
When you turn the crank, the axle and the egg-shaped disc spin around. The rod resting on the disc is pushed up and then drops down, so the bird bobs up and down.
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Age 10: open this week
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In the picture
- Crank handle: you turn it round and round
- Cam: an egg-shaped disc that spins with the axle
- Follower rod: rests on the cam and slides up and down
- Bird: moves up and down as the rod moves
Examples
- The toys in a wooden automaton that move up and down when you turn a handle
- The valves in a car engine, which are pushed open by a turning shaft with cams
Key takeaways
- A cam changes turning motion into up-and-down motion.
- The shape of the cam decides how high and how fast the follower moves.
Quiz: A bird that rises with a crank (Age 10)
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What does a cam mechanism change?
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What decides how high and how fast the follower rod moves?
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What does the follower rod do?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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