Page 342 - Lego Mindstorms

Robot 10 • RIS Turtle

Turtle Step 41

Add the penholder sub-assembly. Note that the liftarms will have to
be pressed inward slightly so they can clip onto the half-pins in the
turtle base. This is a bit awkward, but it locks the penholder to the
Turtle base, making the assembly more solid. Once the penholder is
in place, you can try out the direction splitter mechanism. Turn the
secondary motor by hand and watch what happens. When you
turn it one way, the gear shifter will move, and when you turn it
the other way, the penholder will move. You should also try out the
gear shifter at this stage. Turning the secondary motor by hand,
shift the gears into one position. Now turn the drive motor by
hand and see which way the drive axles turn. Then shift gears into
the other position, and turn the drive motor again. The direction
the left drive shaft turns should be reversed.

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