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Budget Robotics
Octabot
Assembly Instructions
The Budget Robotics Octabot kit is a low-cost 7" diameter servo-driven robot base, ready for expansion.
Assembly is simple, and takes less than 15 minutes.
The Octabot comes with two "decks" for mounting the servo motors, batteries, sensors, microcontroller,
and other components. Additional decks can be added if desired. We recommend no more than three
decks total, to reduce the possibility of the robot tipping over.
The Octabot uses the popular "differential steering" motor arrangement, where the robot is propelled by
two motors and wheels on opposite sides of the base. A caster, placed at the rear of the Octabot,
provides balance. With this arrangement, the Octabot is able to move forward and back, turn left and
right, and spin about the axis of the wheels.
The two drive motors are standard R/C airplane servos. Normally, such servos are limited to 180°
rotation only, but the motors included with the Octabot have been modified to permit continuous
rotation. As with all R/C servos, the Octabot motors must be driven using the appropriate control circuit.
This control circuit is not included with the basic Octabot kit.
If you need a control circuit, the OOPic R, from Savage Innovations, (http://www.oopic.com/) is a good
all-purpose solution. The board has connections for attaching up to 16 R/C servos.
Budget Robotics - Octabot
Page 1
Copyright (c) 2002-2006, Budget Robotics
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Summary of Contents for Budget Robotics Octabot
- Page 1 The Octabot uses the popular "differential steering" motor arrangement, where the robot is propelled by two motors and wheels on opposite sides of the base. A caster, placed at the rear of the Octabot, provides balance. With this arrangement, the Octabot is able to move forward and back, turn left and right, and spin about the axis of the wheels.
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Page 2: Assembly Steps
The Octabot kit contains the following parts: Quantity Description 7" diameter base (bottom deck). The base has "wheel well" cutouts for the drive wheels. The base is pre-drilled for the servo motor mounting brackets and caster. 7" diameter 2nd deck. The 2nd deck is attached to the base using risers. Holes in this deck match mounting holes in the base. - Page 3 The screws should be pushed through from the bottom of the base. The nut is fastened on the top of the base. Viewed from bottom Finger-tighten only at this point. Budget Robotics - Octabot Page 3 Copyright (c) 2002-2006, Budget Robotics...
- Page 4 If you are using alternative servos than those that come in 4-40 x 1/2” Servo mount the Octabot kit, you may need to bracket lightly file the inside pocket of the servo mounting bracket to enlarge it to accommodate your servo.
- Page 5 Step 4 Attach the caster using two 6-32 x 1/2" machine screws and nuts. Budget Robotics - Octabot Page 5 Copyright (c) 2002-2006, Budget Robotics...
- Page 6 Be sure to press the wheel onto the shaft firmly while tightening the screw. Do not over-tighten the wheel mounting screw, or it may break off! Budget Robotics - Octabot Page 6 Copyright (c) 2002-2006, Budget Robotics...
- Page 7 6-32 "high profile" hex nuts onto each riser. These "high profile" nuts act as couplers in case you wish to add a third deck to the Octabot. Step 8 The based is drilled with several large holes for wire "feed through,"...
- Page 8 Servo Centering Adjustment The Octabot uses standard R/C model airplane servo motors that have been modified to allow for continuous rotation. This modification entails removing a "stop" on the bottom of the drive gear, and disengaging the drive gear from the feedback potentiometer inside the servo.
- Page 9 2. For steps 5 and 7, use (4) each aluminum risers and (8) each machine screws to secure second deck. The second deck aligns with the riser holes in the bottom deck one way only. An optional third deck is included with the Octabot II kit. It is attached to the second deck using the four alternate holes.