Mon Prof Augmenté
Egg Cam Lifts a Wooden Bird
Age 13 · Crafts
A hand crank turns a shaft, and an egg-shaped cam turns with it. As the cam’s wide end rolls under the rod, the rod rises and lifts the carved bird; when the narrow end comes round, the rod drops again.
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Age 13: open this week
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In the picture
- Crank handle: the part turned by hand that spins the shaft
- Egg-shaped cam: its rim pushes the rod upwards as it turns
- Vertical rod: rests on the cam and moves up and down
- Carved bird: rides on top of the rod and flaps
Examples
- A car engine’s camshaft opening and closing its valves
- A sewing machine needle going up and down as the wheel turns
Key takeaways
- A cam turns rotating motion into up-and-down motion.
- The shape of the cam decides how far and how fast the rod moves.
Quiz: Egg Cam Lifts a Wooden Bird (Age 13)
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What kind of motion does a cam change rotating motion into?
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In this automaton, what decides how far and how fast the vertical rod moves?
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When the narrow end of the egg-shaped cam comes round under the rod, what does the rod do?
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