There are some links in the sidebar
to get you started. A quick Internet
search should turn up detailed
instructions to modify your
NOTE: I think the best option
for most people building this robot
is to use a pair of servos that are
already set up for continuous
rotation. The one I would suggest is
the Parallax 900-00008 continuous
rotation servo. This has an opening
on the side so you can adjust the
neutral position of the servo as
needed. By putting a pair of access
holes in the back of the finished
robot near the bottom, these can
be easily re-adjusted at any time
using a long thin screwdriver.
For the wheels, this robot uses
standard servo-based robot wheels
common on small Sumo and Boe-Bot robots. The ones in this article
came from 1SORC, but the new
Parallax 721-00018 (blue) or 721-00019 (red) wheels are a
great option since they have a silicon tire molded directly
onto the wheel, so you no longer need to wrap the wheels
in a rubber band for traction.
These wheels are a breeze to install since all you need
to do is remove the servo horn, press the wheel on the
shaft in its place, and secure it with the original screw.
With the wheels attached, the base is marked for the
rectangular openings to allow each of the main drive
wheels to protrude through the bottom of the base.
Working with plastic is relatively easy and a sharp X-Acto or
other hobby knife will do the job.
There are many different techniques for cutting plastic,
but I usually make a light cut on the outline and then go
over it several more times, cutting each
pass a little deeper. It can sometimes
help to drill a small hole at each of the
four corners. Then, the unwanted plastic
should pop out of the opening.
Two variations of the HC-SR04
Assembly of the SpindleBot base.
48 SERVO 05.2013
Bottom of the