What is a Technic beam, and why does it have holes?

Beams are the bones of every Technic model. A beam is a strong stick full of holes. The holes are all exactly the same distance apart, so you can count holes like a ruler and everything lines up perfectly.

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Complete MightyCog booklet collection: 82 PDF booklets for $12.99. Instructions only; individual booklets remain free.

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Try it yourself

Hold a 7-hole beam next to a 5-hole beam. How many holes longer is it?

Build it: 4 builds that teach beams and holes

  • Tiny Roller🚗 Tiny Roller: Your very first rolling car — only 13 pieces! (level 1 of 5, about 5 minutes, 6 steps)
  • 🎠 Idler Parade Car: A parade of gears rides on top — each one spins the opposite way to its neighbour! (level 1 of 5, about 20 minutes, 13 steps)
  • Pull-back Racer🏁 Pull-back Racer: Pull it back, let it go — ZOOM! A racer with a spring for an engine. (level 2 of 5, about 12 minutes, 10 steps)
  • 🦀 Lazy-Tongs Grabber: Squeeze the handles and the criss-cross arms shoot out to grab things far away! (level 2 of 5, about 20 minutes, 11 steps)

Common engineering questions

How can I try beams and holes at home?

Hold a 7-hole beam next to a 5-hole beam. How many holes longer is it?

Which builds teach beams and holes?

4 MightyCog builds teach it: Tiny Roller, Idler Parade Car, Pull-back Racer and Lazy-Tongs Grabber. Start with Tiny Roller: 6 steps, about 5 minutes.

Ideas that go with it