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Budget Robotics
TankBot Servo
Assembly Instructions
The Budget Robotics TankBot Servo kit is a low-cost servo-driven tracked vehicle designed as a flexible
base which you can use to construct a fully-featured treaded robot.
The TankBot Servo uses two pre-modified R/C servo motors (44 oz-in torque at 6 volts), and a Tamiya
Track and Wheel Set (70100). The Track and Wheel Set contains plastic drive sprockets and idler
wheels, as well as lengths of rubber tracks that are linked together to make treads. Assembly of the
TankBot Servo is easy, and takes less than 20 minutes.
Two decks, or "levels," are provided, for mounting the batteries, sensors, microcontroller, and other
components. An optional third level is available. The finished robot measures approximately 6.75" in
length, 4.75" wide, and 3.5" high. Weight without batteries is approximately 13 oz.
Note that the TankBot Servo kit lacks circuitry for controlling the servo motors. Any of a number of
microcontrollers can be used for this purpose, and most are sized to fit the TankBot. As an example, the
OOPic R is one of many ready-to-go microcontrollers that can be readily used with the TankBot Servo.
Budget Robotics - TankBot Servo
Page 1
Copyright (c) 2002-2006, Budget Robotics
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Summary of Contents for Budget Robotics TankBot Servo
- Page 1 The TankBot Servo uses two pre-modified R/C servo motors (44 oz-in torque at 6 volts), and a Tamiya Track and Wheel Set (70100). The Track and Wheel Set contains plastic drive sprockets and idler wheels, as well as lengths of rubber tracks that are linked together to make treads.
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Page 2: Parts List
Parts List The TankBot Servo kit contains the following parts: Quantity Description Base measuring 5 3/8" x 2 1/2" Second deck measuring 4 5/8" by 2 7/8". The base and second deck are separated by risers Left and right track mounting rails Track rail top support Tamiya Track and Wheel Set (70100);... -
Page 3: Assembly Steps
TankBot. Likewise, its three base mounting holes are countersunk on the right side. Orient one servo in the servo mounting pocket of the left rail, as shown. Budget Robotics - TankBot Servo Page 3 Copyright (c) 2002-2006, Budget Robotics... - Page 4 Observe the fasteners are attached at opposite corners of the servo. Note: Four sets of fasteners are provided for each servo, but only two are needed. Hand-tighten only at this point. Budget Robotics - TankBot Servo Page 4 Copyright (c) 2002-2006, Budget Robotics...
- Page 5 (see the figure inset in Step 3 for fastener assembly). As with the small rollers in Step 3, only hand tighten the locking nut. Budget Robotics - TankBot Servo Page 5 Copyright (c) 2002-2006, Budget Robotics...
- Page 6 2. Untighten by 1/8 of a turn until the roller spins without binding. Do not untighten to the point where the roller becomes wobbly. Budget Robotics - TankBot Servo Page 6 Copyright (c) 2002-2006, Budget Robotics...
- Page 7 The servos do not need to be loosened. Simply remove the sprocket from the servo motor shaft. Budget Robotics - TankBot Servo Page 7 Copyright (c) 2002-2006, Budget Robotics...
- Page 8 TankBot (by the servo motors). Using two #6 x 3/4" self-tapping screws, attach the left rail as shown. Do not over-tighten the screws, or the plastic may become deformed. Budget Robotics - TankBot Servo Page 8 Copyright (c) 2002-2006, Budget Robotics...
- Page 9 Step 10 Using two #6 x 3/4" self-tapping screws, attach the track rail top support, as shown. Do not over-tighten the screws, or the plastic may become deformed. Budget Robotics - TankBot Servo Page 9 Copyright (c) 2002-2006, Budget Robotics...
- Page 10 (Note: The sprocket and rollers are not inline. This is intentional. The center-line of the sprocket is inset approximately 5/64"-1/8" from the center-line of the rollers.) Budget Robotics - TankBot Servo Page 10 Copyright (c) 2002-2006, Budget Robotics...
- Page 11 Servo Centering Adjustment The TankBot Servo 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 12 8. When done, replace the output and center gear. Replace the top casing and four casing screws of the servo. Reattach the servo to the track mounting rail, and the sprocket to the servo. The TankBot Servo is available from: Budget Robotics PO Box 5821 Oceanside, CA 92056 http://www.budgetrobotics.com/...