Index
Erector Set, 39 Estimating Coefficient of Friction project, 81–83 Etsy.com, 278 events, cam, 241 extension springs, 232–234 extrusions, aluminum, 41 eyebolts, 62–63
F fabrication analog. See analog fabrication design for manufacture, 256 digital, 258, 274–276 making things move ecosystem and, 257 rule of pi in, 266–267 face cams, 242 farad unit, capacitance, 113 fastening and joining parts nonpermanent joints. See nonpermanent joints (fasteners) overview of, 52 permanent joints. See permanent joints fastening screws, 16 fatigue failure, of materials, 36 feet per second (ft/s), velocity, 14 Fender Blender, bicycle-powered, 117–118 finishing nails, 64 first class levers, 3–7, 9 fish scales, measuring force, 89–90 flag hoist, as open pulley system, 11 flanged couplings, attaching components to motors, 206 flatted motor shafts, 204–205 flexible shaft coupling, 208–209 flexiforce pressure sensors, 90 fluids defined, 115 motorless motion with, 184 wind, water and other, 115–116 Flying Pig, 46, 238, 247 F=ma, 2 foam core, 47 foam tape, double-sided, 69
foams, 42–44 followers, 240–242 food, creating power from, 116–117 force. See also input (effort or force) calculating spring stiffness, 118 calculating work, 2 defining work, 97 estimating torque, 74–75 free body diagrams illustrating, 85–88 friction as. See friction gear ratios when magnifying, 22 measuring, 89–90 Measuring Motor Torque project, 91–93 relationship between torque and, 74–75 using machines to multiply/change direction of, 3 using wheel and axle to magnify, 15 force multipliers, 7 force reducers, 8–9 force-sensitive resistors (FSRs), 89 Forstner bits, 200 four-bar linkages, 243 free body diagrams, 84–88 free fit, screws, 54 free length, compression springs, 231–232 friction coefficient of, 80 Estimating Coefficient of Friction project, 81–83 free body diagrams illustrating, 85–88 overview of, 77–81 reducing, 83–84 friction drive, 10 friction-drive cranks, 239 FSRs (force-sensitive resistors), 89 ft/s (feet per second), for velocity, 14 fulcrum (pivot point) in first class levers, 3–7 as lever component, 3 in second class levers, 7–8 in third class levers, 8–9
G gaffer tape, 69 gage thickness, of sheet metal, 40 Ganson, Arthur, 251 gas welding, of metals, 70 gear ratios, DC gearhead motors, 133 gear type, standard hobby servo motors, 136 gearboxes, 18 gearheads DC gearhead motors, 131–133 defined, 18 gears attaching to motor shaft, 209 belt or chain drives vs., 227 bevel, 20 compound, 225–226 defined, 18 equations for, 214–215 idler, 225 in Make Your Own Gears project, 215–224 overview of, 212–214 planetary, 21–22 rack-and-pinion, 19–20 ratios of, 22 spur, 19 in Wind Lantern project, 296, 300 worm, 20–21 gel cell batteries, 109 Geneva stops, 249 glue attaching gears/other components to shafts, 209 in Not Lazy Susan project, 282 wood, 46 Google Sketchup 2D and 3D modeling tool, 260 Unfold tool, 266 graffiti robots, 84–88 grapes, squishing with wooden power screws, 230–231 Grashof’s law, and linkages, 244 gravity, in free body diagrams, 85
341