your B9 robot ends up being mobile or not, it’ll still need
a set of wheels. A full set consists of 32
wheels made up of four different sizes. Only 16 wheels show
on the front and back of the tread section, so it’s possible
to do less than a full set. However, eight additional wheels are
visible from the sides, so you might consider making 24 wheels total.
Metal wheels are the ultimate, but they are
expensive and maybe not necessary for a stationary model. PVC pipe
can be used with end caps attached to give the same look.
I used solid PVC rod
to make mine. They’re stronger than pipe but still inexpensive.
I had someone turn the wheels on a lathe to the dimensions shown
in the diagram here. If you get both 3"
and 4" stock, it's a matter of cutting the required size for
each wheel, turning each piece to the correct depth, and drilling
a center hole. Easy for me to say, since I didn't personally do
the work, but those are the steps. I primed and painted them with
silver/aluminum paint, and they came
out good. The cost of the PVC material was about $50.
For absolute authenticity, you could also drill
out additional holes in the sides of each wheel. The original robot’s
wheels were done this way, but most builders haven’t included
this detail. Craig Reinbrecht has done this (click
for a photo).
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