would run for the full three minutes.
Spinjitsu debuted at Motorama in
February, and struggled from some
bugs and design flaws that could only
be discovered in the arena. In its first
match, I fought a robot with a wedge
and a vertically-spinning beater bar.
The first hit my opponent got with its
beater bar knocked the whole shell
assembly upwards, pushing the press-fit flag off of the shaft and causing
the weapon belt to pop off of the
pulley. I chose to tap out rather than
suffer three minutes of damage.
This match also
proved that the teeth
were not made of a
material, as they had bent upwards
after only a few seconds of combat.
After hammering these flat, we
decided to drill a hole into the top of
the shaft, and screw a bolt in which
would hold some washers in place
over the flag. This whole assembly
was to keep the shell from jumping
In its second fight against a
standard wedge bot, Spinjitsu was
putting up a decent fight when it
stopped dead after a wall impact. I
was able to trace this problem back to
a loose wire in the system. An
unfortunate way to lose, but that’s
how it goes sometimes.
The teeth had also bent upwards
again; this time from simply hitting
the arena kickplate. For the next
competition, I plan to replace the
blades I had designed with much
thicker weapon teeth in order to
In conclusion, a full-body spinner
is a tough robot for anyone to pull
off, so watching mine take shape was
an exciting process. Despite its early
failure in its debut, I have hopes that I
can keep improving on this design and
eventually emerge with a
championship-winning machine. SV
26 SERVO 08.2017
· 10mm-300mm stroke
· 6v-12v power supply
· 25kg+ available force
· 15g-100g net weight
MICRO LINEAR ACTUATORS
Make your machine move
The finished version of Spinjitsu,
ready for Motorama.
Bent teeth after combat. They
weren’t solid enough at all.