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9/16 1 5/8 2 1/8 (Note: Not to scale) FIGURE 20.13 Use this template to construct a servo mounting bracket. The template may not be reproduced in 1:1 size, so be sure to measure before cutting your metal or plastic. 3/16
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Figure 20.14 shows a servo mounted on a bracket and attached to a LEGO beam. If necessary, the servos can be easily removed for repair or replacement.
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FIGURE 20.14 A servo mounted on a homemade servo bracket.
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318 WORKING WITH SERVO MOTORS
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Using batteries to power your robot Fundamentals of robot locomotion Choosing the best motor for your robot Ways to implement computers and microcontrollers to your robots Interfacing servos and other motors to control circuitry
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15, All about Batteries and Robot Power Supplies 16, Robot Locomotion Principles 17, Choosing the Right Motor for the Job 28, An Overview of Robot Brains 29, Interfacing with Computers and Microcontrollers
PART
PRACTICAL ROBOTICS PROJECTS
Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
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BUILD A ROVERBOT
Imagine a robot that can vacuum the floor for you, relieving you of that time-consuming
household drudgery and freeing you to do other, more dignified tasks. Imagine a robot that patrols your house, inside or out, listening and watching for the slightest trouble and sounding the alarm if anything goes amiss. Imagine a robot that knows how to look for fire, and when it finds one, puts it out. Impossible A dream Think again. The compact and versatile Roverbot introduced in this chapter can serve as the foundation for building any of these more advanced robots. You can easily add a small DC-operated vacuum cleaner to the robot, then set it free in your living room. Only the sophistication of the control circuit or computer running the robot limits its effectiveness at actually cleaning the rug. You can attach light and sound sensors to the robot, providing it with eyes that help it detect potential problems. These sensors, as it turns out, can be the same kind used in household burglar alarm systems. Your only job is to connect them to the robot s other circuits. Similar sensors can be added so your Roverbot actively roams the house, barn, office, or other enclosed area looking for the heat, light, and smoke of fire. An electronically actuated fire extinguisher containing Halon is used to put out the fire. The Roverbot described on the following pages represents the base model only. The other chapters in this book will show you how to add onto the basic framework to create a more sophisticated automaton. The Roverbot borrows from techniques described in 10, Building a Metal Platform. If you haven t yet read that chapter, do so now. It will help you get more out of this one.
Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
322 BUILD A ROVERBOT
Building the Base
Construct the base of the Roverbot using shelving standards or extruded aluminum channel stock. The prototype Roverbot for this book used aluminum shelving standards because aluminum minimized the weight of the robot. The size of the machine didn t require the heavier-duty steel shelving standards. The base measures 12 5/8 inches by 9 1/8 inches. These unusual dimensions make it possible to accommodate the galvanized nailing (mending) plates, which are discussed later in this chapter. Cut two pieces each of 12 5/8-inch stock, with 45 miter edges on both sides, as shown in Fig. 21.1 (refer to the parts list in Table 21.1). Do the same with the 9 1/8-inch stock. Assemble the pieces using 1 1/4-by-3/8-inch flat corner irons and 8/32 by 1/2-inch nuts and bolts. Be sure the dimensions are as precise as possible and that the cuts are straight and even. Because you are using the mending plates as a platform, it s doubly important with this design that you have a perfectly square frame. Don t bother to tighten the nuts and bolts at this point.
125/8"
91/8"
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