SERVO 08.2017 21
the chassis from this material.
The result of this first round of
milling is shown in Figure 2, with the
central frame rails being linked to the
front block. In addition to this chassis
design, I went with brushless in order
to keep the price low.
In “modern day” combat robotics,
there is a movement affectionately
called “Brushless Hipsterism” which
refers to the transition towards using
brushless motors over brushed ones.
There have been previous articles
here in the Combat Zone that have
talked about this topic in-depth, but
the gist of the
movement is that by
comparable size to a
brushed motor you
get a larger amount
This is due to
having much more
power pound-for-pound than a
brushed motor (this
term is known as
Therefore, with this design, I used a pair of
Traxxas Velineon 3,500 kV motors that I had from
hobby monster trucks that I race on the side. These
motors (which will be running on 3s LiPo batteries)
were then paired together with drill motor gearboxes
from Harbor Freight.
By pairing these together, I was hoping to get a
fast and cheap drive train to offset the lifting weapon
(when one doesn’t have a high kinetic energy like a
spinner, it’s good to be able to run faster!), and keep
Moving on, the next stages of manufacturing
included building the drive train. In Figure 3, you can
see that the base is starting to take shape, as well as
the drive train.
The wheels are 3” x 7/8” Colson versions which
are being driven by hubs (shown in Figure 4), which
will be used to connect the Finger Tech Robotics’
pulley to the drive motor.
Those hubs will be tapped for #6-32 screws and
lock the hub in place. This whole driving arrangement
can be seen in Figure 5 (though the end cap is