Page 271 - Lego Mindstorms

Robot 9 • The SpinnerBot

The Arm Drive

This is the upper half of the power train for the lifting arm of the SpinnerBot. The motor here will
drive a pulley belt to the Lower Arm Drive sub-assembly. The size of the pulley on the motor is
larger, giving about a 3:1 speed increase, which will be offset by the worm gear in the Lower Arm
Drive sub-assembly.

Arm Drive Step 0

Connect the pieces to the
motor as shown. Place this
assembly off to the side. You
will need this in Arm Drive
Step 6.

256