FIGURE 2. This is the support structure for the arena floor.
FIGURE 3. The framing for half of the two-part roof gives us four
equal sized rectangles to cover with polycarbonate.
30 SERVO 12.2012
polycarbonate can flex and move to an
extent under a heavy impact, further
reducing the chances of failure.
With the walls so well protected, there
weren’t many exposed surfaces that
generally are hit by weapons that aren’t
protected. The main area that was not
covered was the arena side of each leg. In
an effort to extend the life of the legs, we
attached some thick steel angle bracket for
the first nine inches of the leg above the
After completing the walls and adding
the leg guards, we attached the aluminum
flat stock that slots into the extruded
channel. This mounting method retains the
walls across a large surface area and helps
spread any stresses out to reduce the
chance of individual screws breaking
With things moving along quickly, it was
time to focus on the aesthetic aspects of the
arena build. The two layer floor allows easy
replacement of damaged floor sections, but
hardboard is dark and shiny which won’t
turn out well on camera, so a coat of gray
primer was added. After the primer dried,
we added starting squares to each corner.
The polycarbonate panels were
attached to the roof, then the roof panels
got a coat of paint. These roof panels are
held in place with spring clamps during an
event to prevent them from popping open
during an impact.
One member of the build crew insisted
on adding color to the arena structure as
they were sick of painting everything black,
so the legs ended up getting a coating of
bright red paint.
At this point, the arena was nearly
done. The main build left was the push-out
box and installation of the lighting. Before
doing that, it was time for another test fit
to verify that nothing had crept up on us
during the last few days of work.
With everything looking good, it was
time for the last few pieces to be made. The
catch box was designed to hold a large
number of robots since rumbles are fairly
common at Micro Battles events, and with
FIGURE 4. The support sections and
cutouts are visible on the legs, as well as
the spring clamps that hold most of the