Cardboard Eccentric Cam-Shaft Flapping Bird Automaton

50 mins Ages 8-14 Indoor

An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 8 to 14.

Materials Needed

  • • Sturdy small open cardboard box or tissue box (1 unit)
  • • Wooden skewers (axle and pushrod) (2 units)
  • • Cardboard discs for off-center cams and crank handle (3 discs)
  • • Plastic drinking straw (follower guide) (1 straw)
  • • Paper bird or character cutout (1 unit)
  • • Hot glue gun and scissors (1 set)

Pro Tips

  • → An eccentric cam is an egg-shaped or off-center cardboard disc mounted on a rotating skewer axle.
  • → A vertical drinking straw rests on top of the cam as a follower.
  • → Turning the hand crank rotates the off-center cam, pushing the follower rod up and down to make a mounted paper bird flap and dance.

Safety First

Adult supervision required when using hobby utility knives and hot glue guns.

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Step-by-Step Instructions

1

Step 1

Pierce horizontal axle holes through opposite walls of an open-front small cardboard box frame.

2

Step 2

Cut an off-center circular cardboard cam and glue it onto a wooden skewer axle installed through the frame.

3

Step 3

Glue a short vertical straw guide to the box ceiling directly above the cam, inserting a follower pushrod.

4

Step 4

Attach a colorful paper bird to the pushrod tip, crank the handle, and watch the automaton dance with smooth mechanical rhythm.

What they are learning

Rotary-to-reciprocating linear motion conversion Eccentric cam and follower mechanics Historical mechanical automaton engineering