Page 295 - LEGO MINDSTORMS - Robotics Invention System-2 Projects
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Robot 9 • The SpinnerBot
Final Step 14
Attach the Drive Mechanism sub-
assembly as shown. The dangling
1x4 TECHNIC beam from the Drive
Mechanism should slip between
the differential and the Inner RCX
Bracket, aligning with the half-
length pin there. Once you have
firmly attached the sub-
assembly, reach in with
your fingers or a narrow
plate and firmly snap the 1x4
TECHNIC beam onto the half-
length pin. This will prevent the
Drive Mechanism from
gradually working apart.
Final Step 15
Attach the Lower Arm Drive sub-
assembly as shown. As you
attach the drive, lift the dangling
axle connector you added in
Lower Arm Drive Step 5 and set
it on top of the 24t gear from
the Right Side Frame. This will
prevent the right wheel
from rotating backward. Test
this by rotating the protruding
right axle either way. It should
move freely in one direction and
lock in the other. If it does not,
try re-seating the sub-assembly.
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