Page 232 - LEGO MINDSTORMS - Robotics Invention System-2 Projects

Robot 8 • The ULK (Useful LEGO Knowledge)

Arm Assembly

ULK’s arm is controlled by a single motor. When the motor turns clockwise (reverse direction
according to the RCX), ULK lowers its arm, closes the fingers, and then raises the arm. Running the
motor in the counter-clockwise direction (forward direction) lowers ULK’s arm, opens the fingers,
and then returns the arm to the upright position.

Arm Assembly Step 0 Arm Assembly Step 1

Slip the axles
of the Arm
Motor sub-
assembly into
the correct holes
and hold
everything in place
with the bushing.

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