Build a Crank Mechanism

Build a simple machine that transfers rotational motion into linear reciprocating motion (repetitive back and forth motion).

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Inspiration Video

Suggested Materials

  • small boxes or cardboard
  • bendy straws
  • tape
  • hole puncher
  • scissors

Difficulty Level

1
2
3

This design challenge may require moderate motor skills, understanding of some abstract concepts, or uncommon materials to build.

This is the difficulty level for a typical 4th grade classroom. Modify as needed for other age groups.