Your robotic problems solved here.
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got really lucky and found a drill bit that was exactly the
same as both my wheel and my hub. I then clamped it into
my hobby vice, which weighs about five pounds. This is a
very secure and tough mount (Figure 2).
The next step is to place your wheel on the shaft such
that the surface you will be drilling into is face up. Then,
mount your hub on top of the wheel and put pressure
down on to the wheel while tightening the grub-screw of
the hub to the shaft (Figure 3). Before you tighten
everything down, align your hub’s screws with how you
want to drill the mating holes in your wheel.
If everything is clamped and tightened well, the hub
and wheel won’t move relative to each other. This is very
important! You don’t want the holes you are going to mark
to move out of alignment, or you won’t be able to bolt the
wheel to the hub.
Now, you need a way to mark where you are going to
drill the holes in the wheel, and preferably in a way that is
easy to get the drill bit to center on and not wobble away.
I like to use an awl or a scribe. If you have ever worked
with leather, then you know what an awl is – it’s a really
sharp pointy tool that allows you to punch stitching holes in
leather. If you are a metal shop sort of person, a scribe is a
really sharp pointy tool that you use to scratch or scribe cut
or bend lines on metal.
The secret here is that the awl/scribe needs to be small
enough in diameter to fit through the holes in your hub so
that you can put a pit in the plastic of the wheel (Figure 4).
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