Page 248 - Lego Mindstorms

Robot 8 • The ULK (Useful LEGO Knowledge)

Final Step 6

The perpendicular axle joiner rests
against the 40t gear and creates a
ratchet. When the gear rotates counter-
clockwise, the axle joiner skips across
the top of the gear teeth. If the
gear tries to rotate clockwise,
the axle joiner catches in the
gear teeth, preventing the
gear from turning.

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