Build Your Own Combat Robot

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Construction, cost factors in large robot, 35–36 Construction techniques, robot material and, 183–201 general machining operations, 192–201 metals and materials, 184–193 when in doubt, built it stout, 201 Contacts NC (normally closed), 129 NO (normally open), 129 welded relay, 130 Contests compete in fastestgrowing robot, 277 competing in, 33 current rules and regulations, 16 designing robots for multiple, 23 what can go wrong during, 34 Control radio interference and reliable, 170–173 relay, 128–139 variable speed, 139–155 Control channels, 160–166 50MHz radio frequency band, 163 radio frequency crystals, 164–165 75MHz radio frequency band, 163–164 72MHz radio frequency band, 163 27MHz radio frequency band, 162–163 United Kingdom radio frequency bands, 164 Control of motors bi-directional, 143 variable speed, 143 Control systems must fulfill several requirements, 158 traditional radio, 154 Controllers adding, 317–319 cheaper hobby, 145 commercial electronic speed, 143–155 4QD speed, 152–153 IFI Robotics Victor, 147 motor, 299–300 motor speed, 26 OSMC Motor, 153–155 speed, 172 Vantec Speed, 149–152 Victor 883 Speed, 147–149 Controller’s interface, RC, 159 Controlling heat with ESCs, 73 motors with relays, 132 Controlling one’s motors, 127–155 relay control, 128–139 variable speed control basics, 139–155 Controlling speed = controlling voltage, 140 Controlling voltage, 140 Controls, traditional RC, 158–160 Conversion factors of batteries, 86 Cool, keeping motors, 113 Coolrobots, Team, 44 Copper wire minimum current ratings, AWG, 91 Cordless drill motors, 75 Cost considerations, 30 Cost factors in large robot construction, 35–36 Countersinks, 198 Coupling, Lovejoy, 114 Creating armor, 311–314 weapons, 311–314 Crimp style connectors, 339–340 Crusher bots, 231–233 crusher design, 231–233 strategy, 233 Crystals, frequency, 164–165 Current batteries limiting amount of, 72 fighting robots will draw lot of, 81 no-load, 63, 64, 68 voltage stability for peak, 88–89 Current capacities in batteries, estimating, 91 Current capacity in hobby ESCs, 145 Current draw measuring from batteries, 80–81 specifications from robot motors, 26 using Ohm’s Law to measure, 81 Current ratings, 129–131 AWG copper wire minimum, 91 Cutting metal, 194 Cycle, duty, 141 Index 363
364 Build Your Own Combat Robot D Data checksum signal, 168 Data sheets, battery manufacturer’s, 91 Data sheets, motors that come without, 80 DC (direct current) motors, 63 DC motors, permanent magnet, 67 Deadblow, 105 Grant Imahara and, 66–67 Design motors place greatest constraints on, 62 robot, 23–34 Design process adding weapons to, 27 starting, 22 Designing bot frames, 26 high powered robots, 115 for maintenance, 31–33 robots for multiple contests, 23 robots on paper or CAD, 30 Destructive robots, 3 Detectors edge, 286–290 infrared, 287 infrared range, 301 object, 290–292 ultrasonic range, 300–301 Devantech SRF04 Ultrasonic Range Finder, 243–244 Differential steering, 48–50 Diodes, flyback, 137, 138 DIP ICs (dual in-line, pin-integrated circuits), 337 Direct drive method, 104 Discharging batteries in short period of time, 85 Disconnect switches, manual, 132 Distances chain drive centerline, 356 constant standoff, 252–253 timing belt centerline, 357 Divisions, competition, 4 DOF (degrees of freedom), 43 DP (double-pole) relay, 128 Drawings, system interface, 30 Drill/battery/charger combinations, 99 Drill indexes, 193 Drill motors, 99, 194 cordless, 75 Drill presses, small bench-top, 194 Drive method, direct, 104 Drive systems, relay-based, 140 Drives belt, 118–121 chain, 115–118, 356 passive wheel, 57 powered axle, 57–59 right-angle, 123, 124 wheel, 57 Driving control of robots, 154 practice, 34 Drum bots, 226–228 drum design, 226–228 strategy, 228 DT (double-throw) relays, 129 Duty cycles defined, 141 expressed as percentage, 141 limiting, 72 E Edge detector, 286–290 EEPROM (electrically erasable programmable read only memory), 263 Efficiency of motors, 73 of propulsion system, 46 Electric motor basics, 62–75 determining motor constants, 67–68 power and heat, 68–72 pushing limits, 72–75 Electric motor sources, 344–346 Electric motors acquiring, 74 best places to get, 74 most combat robots use, 76 Electrical noise, gasoline engines and, 172 Electrical wiring requirements, 91–92 Electrically erasable programmable read only memory (EEPROM), 263 Electronic circuits, using prototyping boards for, 336–337 Electronic speed controllers (ESCs), 73, 128, 172, 299, 300 commercial, 143–155 controlling heat with, 73 current capacity in hobby, 145 vendors, 346–347 Electronic speed controllers (ESCs), commercial, 143–155 hobby, 143–146
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Build Your Own Combat Robot Pete Mi
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For more information about this boo
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Contents For more information about
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Current Ratings, 129 How It All Wor
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Object Detector, 290 Sensor Integra
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Acknowledgments We would like to th
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Introduction Some kids spend their
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About the Authors xv About the Auth
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2 ELCOME to the world of combat rob
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4 Build Your Own Combat Robot FIGUR
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6 Build Your Own Combat Robot aroun
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22 S we said in Chapter 1, it’s g
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30 Build Your Own Combat Robot Befo
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32 Build Your Own Combat Robot What
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34 Build Your Own Combat Robot Test
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36 Build Your Own Combat Robot S af
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38 Build Your Own Combat Robot Ther
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42 OVING is what many might call a
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52 Build Your Own Combat Robot You
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chapter Motor Selection and Perform
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Chapter 4: Motor Selection and Perf
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FIGURE 4-1 Typical motor performanc
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Determining the Motor Constants Cha
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FIGURE 4-2 Heat generated in an ele
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FIGURE 4-4 Motor power changes by d
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Chapter 4: Motor Selection and Perf
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FIGURE 4-7 24-volt, 185 rpm, 896 in
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the robot. If the engine is used to
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80 LECTRICALLY powered competition
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104 NE of the most important consid
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128 F batteries are the source of p
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chapter Remotely Controlling Your R
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FIGURE 8-1 Wiring and rotational po
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FIGURE 8-2 Futaba’s top of-the-li
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Chapter 8: Remotely Controlling You
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FIGURE 8-4 Typical radio frequency
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FIGURE 8-5 Motor with three capacit
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Innovation First Isaac Robot Contro
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FIGURE 8-6 Block diagram of Isaac o
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chapter 9 Robot Material and Constr
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Metals Aluminum Chapter 9: Robot Ma
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Stainless Steel Chapter 9: Robot Ma
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Titanium used to solder small brass
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Chapter 9: Robot Material and Const
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Welding, Joining, and Fastening We
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place, or some liquid may have ente
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vibration and bounce around the ins
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204 ECAUSE robot combat has evolved
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240 HE robots described in the book
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250 Build Your Own Combat Robot One
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chapter 12 Robot Brains Copyright 2
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FIGURE 12-1 From top left to bottom
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Chapter 12: Robot Brains 263 space
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FIGURE 12-2 The BoeBot from Paralla
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Handy Board BotBoard Chapter 12: Ro
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FIGURE 12-5 Robo-Goose, a robotic g
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FIGURE 12-8 A fully autonomous robo
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S ummary Chapter 12: Robot Brains 2
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276 HE referee signals, and my hear
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chapter 14 Real-Life Robots: Lesson
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FIGURE 14-1 Chew Toy Chapter 14: Re
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FIGURE 14-2 Chew Toy with protectiv
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FIGURE 14-3 Wheel shown bolted to d
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Page 375 and 376: 356 OLLOWING are formulas that you
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Page 401: INTERNATIONAL CONTACT INFORMATION A
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