56 SERVO 07.2016
interactive. I can use a person who is situated off to the
side to view the audience and converse with the character
live. This is a great application if you have someone
available who can play the part.
Used models can often be salvaged from their original
installations. The set shown in Figure 3 was given to me by
a friend who thought I could use them. I am thrilled when
my friends think of me as they come across items like this!
I believe this came from a lift bed that was being
disposed of. They are extremely heavy duty and I am still
looking for just the right project for them.
These look much like a linear actuator but come with
the control board built into the mechanism, so it does not
require an external motor controller.
My first attempt at using one came when I was
designing “ParkerBot” — my spider built onto a remote
controlled chassis. I detailed
the build in the September
2015 issue of SERVO
Magazine where you can
check out the entire design.
The mechanism which
used a model from
ServoCity (see Resources)
worked perfectly (refer to
Figure 4 and Figure 5), but
the weight proved to be too
much for the lightweight
motors I was using to
maneuver the spider. I
ended up replacing the
linear servo with a lighter
weight channel mount
servo powered gearbox.
Even though it did not
work out as originally
planned, I was excited to try
to use one again. Watch
upcoming articles to see
where this will pop up as I
have a new plan for it!
Figure 5. It works with the
RC transmitter, as well. Figure 6. They are mighty and small!
Figure 3. You
Figure 4. Testing the ParkerBot mechanism.