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Here is a picture of the bottom of the truck.
After seeing the drawing in previous page, you can see a few of
the essential parts. The blue plates hold the motor to the bottom
of the truck, just to the right, you can see the on/off switch for
the battery pack. A few of the gears that run the system are visible,
but most of them are in shadow.
The steering system is easy to see down here. Notice the
traditional Lego 1x plates that go between the front tires are missing.
They have been replaced by 2xs, with the steering arm mounted
between them. The large tires I used mount very far out on the axle,
unlike real vehicle tires which mount so that the center turning
point is in the center of the tire. The farther you move the tries
out from the turning point, the more your tire moves, so the tires
had to be mounted very close to the steering arms. If they were
any further out, the wheel well pieces would not have fit well.
The weight of this truck is enormous, so putting all of it
on six axles concerned me. To help the axles out, I added the insides
of some other tires to the frame. They take a little of the stress
off of the axles. If you know what the back of a large Lego tires
looks like, you may be able to discern where the other tires are
in this photo. Even with this precaution though, continued stress
will bend or break the axles, so I built a small platform that keeps
the wheels off the ground. The truck stays on that platform unless
I am showing it off.
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