cutting to make each part.
The top and bottom panels
are 1/16” 6061 aluminum. I use a
better grade (7075) in my combat
bots, but the 6061 should be fine
in a hockey bot.
The drive motors are standard
Kitbots1,000 rpm Beetle motors
with matching mounting plates.
I’ll mount them in a thicker block
of UHMW (Figure 5) and secure
them to the bottom panel with a
couple of screws. This will allow
any failed units to be swapped
out very quickly.
The chassis is held together by
four sections of nutstrip: one in
each corner and by the bottom
panel (Figure 6) which is held in
place by 12 self-tapping screws
(the other eight screws shown are
to secure the drive motors).
The top view (Figure 7)
shows the four motors in place
and also the four short sections of
nutstrip which will allow the top
to be secured using only four 6-32
I chose these over self-tapping
screws since they will be taken out
every time the bot is charged up.
Plus, if the nutstrip is damaged,
it’s easy to replace.
The top panel shown back in
Figure 4 has a 0.9” diameter hole
to mount a rocker switch with an
integral LED (Figure 8) that will
be used to power up the bots. I
got the switches from All
com; catalog number LRS-28B).
Once I was happy with the
design, I ordered the required
UHMW strip, enough water-cut
top and bottom panels for seven
bots, and a set of steel templates
of the front/back panel, side
panels, and the motor mounting
Part 2 will cover the
manufacture of the various parts.
SERVO 02.2013 35