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Robot 9 • The SpinnerBot
The Arm Pivot
This sub-assembly serves two important functions: It provides power to the Gripper Arms, and once
those arms are closed around an object, it serves as the pivot for the entire lifting arm. This happens
because the 8t gear in the Gripper Drive Shaft can no longer turn once the grippers are closed. The
force from the 24t crown gear in the Arm Pivot lifts the entire arm instead, and the flag leaves the
ground.
Arm Pivot Step 0
Leave a one-and-a-
half stud space at the end
of the axle, and a one-stud
space between the two bushings.
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