Round Robot
Chassis
User’s Guide
Contents:
Parts List
Chassis Drawing
Contacting Pololu
Assembly Instructions
Description and Specifications
© 2002
http://www.pololu.com/
Pololu
RRC01A
Parts List
Included in this kit are a round chassis plate and a square spacer with four holes (shown
below). To build your robot, you will also need the Tamiya twin-motor gearbox
(70097), ball caster (70144), and truck tires (70101) kits that are packaged separately.
Chassis Drawing
The following is an actual-size drawing of the chassis.
Many holes and cutouts do not have a specific purpose, and
you can easily add your own holes to customize your robot.
ball caster
spacer
Top View
ball caster
mounting
holes
right
wheel
hole
Front
© 2002
http://www.pololu.com/
Pololu
gearbox
set screw
access holes
left
wheel
hole
gearbox
mounting
holes
2
Contacting Pololu
You can check the Pololu web site at http://www.pololu.com/ for latest
information about the robot chassis, including color pictures, robot examples, and
troubleshooting tips.
We would be delighted to hear from you about your project and about your experience
with our robot chassis. You can contact us through our online feedback form or by
email at support@pololu.com. Tell us what we did well, what we could improve,
what you would like to see in the future, or anything else you would like to say!
Assembly Instructions
Before your begin, you should remove the protective paper from the acrylic parts. If
you know about any modifications you want to make ahead of time, you should make
additional cuts and drill holes before removing the paper.
1. Assemble the dual gearbox using the instructions provided with that kit.
Build the gearbox in the ‘C’ configuration, which provides a low-speed gear
ratio.
2. Put wheels on the gearbox axles and mount the gearbox to the chassis plate
using two 3x10mm screws and 3mm nuts that come with the gearbox kit.
Make sure the gearbox is aligned properly with the chassis.
3. Assemble the ball caster using the instructions provided with that kit. Make
the caster in the 25mm height configuration.
4. Use four 3x15mm screws and 3mm nuts to mount the ball caster and spacer to
the main chassis plate. The spacer is not strictly necessary, but it makes the
chassis parallel to the ground, which is usually desirable.
Now, you are ready to customize your robot! Add a control system, sensors, and a
battery to bring your robot to life. Because the front of the robot is weighed down by
motors, you should position the battery above the ball caster to make sure the ball
caster stays on the ground.
© 2002
http://www.pololu.com/
Pololu
3
The Pololu Round Robot Chassis
The Pololu Round Robot Chassis is a small, low-cost mobile platform
for experimenting with robotics. With this kit, you can assemble a
differential-drive robot with independent gearboxes for the right and left
wheels, allowing for very precise motion control. Because the chassis is
perfectly round and the wheels are on a diameter of the circular robot, it
can turn in place without getting stuck.
The chassis plate has many holes for mounting sensors and electronics,
and the acrylic can readily be modified to meet your needs. The chassis
is very low to the ground, allowing you to add plenty of electronics and
sensors to the robot without worrying about it tipping over.
Note: This kit requires the Tamiya twin-motor gearbox (70097), ball
caster (70144), and truck tires (70101) kits that are packaged separately.
You will also need your own electronics circuitry to build a complete
robot.
Specifications
Chassis size.................................... 5” (127 mm) circle
Wheels and motors......................... 2
Drive type...................................... Differential drive
Gear ratio....................................... 203:1
Wheel size...................................... 1.42” (36 mm)
Recommended motor voltage........ 3-6 V
Weight (approximate).................... 5 oz. (140 g)
© 2002
http://www.pololu.com/
Pololu
4
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