Page 284 - LEGO MINDSTORMS - Robotics Invention System-2 Projects

Robot 9 • The SpinnerBot

Spinner Arms Step 7

Each part
required for this step is a 2x2
TECHNIC plate with an unusual under-
side: Underneath each plate is a rounded
hole that allows an axle or TECHNIC pin to be
inserted crosswise through the plate.

Flip the sub-assembly over to attach these plates to the under-
side. The 16t gears from the grippers will overlap the plates
slightly. You may need to loosen the gears slightly on their axles to
allow the plates above them. Test the grippers to make sure that they
still open and close smoothly.

Spinner Arms Step 8

Turn the assembly
upright again to snap the
three-quarter length pins into each
of the two plates and two bricks you just
attached.

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