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Portal 382 xPortal The listings in the following three sections are portals, all-purpose Web sites that offer a mix of news, links, arti- cles, and possibly user-to-user forums. MSN.com and Yahoo.com are good examples of generic portals; the ones here are strictly related to robotics, electronics, and associated endeavors. You’ll find portal listings for: • Other. Portals that don’t fit the other two categories. • Programming. Gathering grounds for those who like to program in various languages and on various platforms. • Robotics. Specialty Web sites just for and about robotics. Most are aimed at amateur robotics. SEE ALSO: Internet-Bulletin Board/Mailing List: More user-to-user forums Internet-Search: Search for robotics and related topics Internet-Usenet Newsgroups: Even more user-to-user forums User Groups: Share ideas with others, either locally or via the Internet xPortal-Other Control.com 203881 http://www.control.com/ In the words of the Web site: “Welcome to Control.com, the global online community of automa- tion professionals. Check out the technical articles, scan the industry news, and participate in the technical discussions.” Controlled.com 202488 http://www.controlled.com/ Links to control—related products for various bus architectures, for “data acquisition, testing, automa- tion, motion control, robotics, communications and more.” eg3.com 202933 http://www.eg3.com/ The eg3.com Web site is a portal that indexes sites, serv- ices, and informational Web pages on embedded sys- tems, DSP, real-time/RTOS, board-level computing, and related topics. MotionNET.com 202570 http://www.motionnet.com/ A directory for mechanical engineers, especially those involved in motion mechanicals. MotionShop.com 204016 http://www.motionshop.com/ Everything on motion control: catalogs, links, listings, manufacturer summaries, and news stories. MotorControl.com 203139 http://www.motorcontrol.com/ Portal for motor control engineering community. Controlled.com Web page. Copyright 2003 by Gordon McComb. Click Here for Terms of Use. PaintballWatch.com 203864 http://www.paintballwatch.com/ Comparison shopping guide for paintball air-pressure system components. Some of these components can be used to construct pneumatic actuators for robots. Or, to make robots that spit paint at one another. Your choice. Plasticsusa.com 204088 http://www.plasticsusa.com/ Links, classified ads, sources, user-to-user forums, and technical information about plastics and plastic-making processes. See also: http://www.polymerweb.com/ Rocketry Online 203020 http://www.rocketryonline.com/ Links, how-tos, resources, sources, classifieds, and more on model rockets. Some rocketry materials have uses in robotics. These include altimeters, accelerometers, and construction materials, such as foam, tubes, and plastic sheets. Wearables Central-Wearable Computing 203660 http://wearables.blu.org Portal; links and information on computers you wear. Be like Seven of Nine, every guy’s favorite Borg. Wear your next computer. Or how about a “wearable robot”? -a robot you wear facilitates your daily life. It might hold your cell phone while you’re driving and talking to Mom; it might carry the third sodaat themovie theater; it might nudge you awake if you doze off while at work. (Okay, for- get the last idea. The first two sound good, though.) Woodworking Pro 202995 http://www.woodworkingpro.com/ A portal for the woodworking professional. News, links, buyer’s guide, and a woodworkers magazine (free to qualified readers). World Tube Audio Portal 202999 http://www.worldtubeaudio.com/ Specialty source for electronic tubes (audio and power), but also provides useful links to general elec- tronics sources, such as soldering and tools. Look in the Directory section. xPortal-Programming AVR Forum 203310 http://www.avr-forum.com/ Stomping grounds for geeks who are into the Atmel AVR line of 8-bit microcontrollers. Includes links, sam- ple code, user-to-user forums, and an AVR FAQ. AVRFreaks 203022 http://www.avrfreaks.org/ User-to-user forums, code examples, resources, applica- tion notes, articles, and links for those involved with programming the Atmel AVR line of 8-bit microcon- trollers. Be sure to check out the free code library (requires free registration). Future AI 202234 http://www.futureai.com/ “Your page for artificial intelligence.” Tutorials, files, articles, news, and user-to-user forum. Portal-other 383 MotorControl.com Web page. TINI Resources 204067 http://www.tiniresources.com/ Resources for TINI and iButton projects. TINI and iButton were originally developed by Dallas Semiconductor, now owned by Maxim. Additional information can be found at: http://www.ibutton.com/TINI/ xPortal-Robotics AceUpLink 203373 http://www.aceuplink.com/ Robot Arena forum; also robotics portal: links, forums, news. Fiction and nonfiction robots. AIBO-Life 203715 http://www.aibo-life.com/ The AIBO-Life Web site provides forums, chat, and news catering to the owners of the Sony AIBO and other robotic pets. BEAM Online 202380 http://www.beam-online.com/ BEAM Online is a BEAM-specific portal for robots. Includes news, links, and a gallery of various BEAM robots. Portal-programming 384 Pekee.fr http://www.pekee.fr/ Robot news, forum, newsletter; in French and English Web page for BEAM Online. Movers and Shakers Hans Moravec http://www.frc.ri.cmu.edu/~hpm/ Dr. Moravec has been designing and building robots since 1963. That’s even before Star Trek! He is now Principal Research Scientist in the Robotics Institute of Carnegie Mellon University and the author of sev- eral books on robotics and artificial intelligence. Botic: The World of Robotics 202051 http://www.botic.com/ News, links, and forums about robots. GoRobotics.net 202056 http://www.gorobotics.net/ GoRobotics is an all-purpose robotics portal, with arti- cles, reviews, links, resources, polls, project repository, and news. The GoRobotics.net portal. Home-Robot.com 202518 http://www.home-robot.com/ General information Web site on home and hobby robotics. hwatkins.com 203741 http://hwatkins.com:81/ Robotics portal, with links, news, project descriptions, and user-to-user forums. Jonny555.co.uk 203708 http://www.jonny555.co.uk/ A robot gallery (industrial, commercial, movie, etc.) and a portal. Says the Web site: “Welcome to the best robotic site on the net. We pride ourselves on bringing you the most up to date robotic information available. You will discover facts about all kinds of robots, from simple robotic toys to the most advanced robots on earth and beyond.” MachineBrain.com 202819 http://www.machinebrain.com/ Robot news and links. Netsurfer Robotics 204083 http://www.netsurf.com/nsr/ News, views, and book reviews, and more about our favorite subject. OnRobo.com 203434 http://www.onrobo.com/ Home and entertainment robotics. Includes news, reviews, and a user-to-user forum. V Reconn’s World 202979 http://www.reconnsworld.com/ Andrew, a.k.a. “Reconn,” provides a message board on robots, some circuit examples, along with examples of his creations. Portal-robotics 385 How Fast Can Your Robot Move? If you know how fast the wheels of your robot turn, you can calculate the speed, in inches per second, that your robot will move. Making the calculation is easy: 1. Divide the speed of the robot, in revolutions per minute (rpm) by 60. The result is the revolutions of the motor per second (rps). A 100-rpm motor runs at 1.66 rps. 2. Multiply the diameter of the drive wheel by pi, which is approximately 3.14. This yields the circumference of the wheel. A 7-inch wheel has a circumference of about 21.98 inches. 3. Multiply the speed of the motor (in rps) by the circumference of the wheel. The result is the number of linear inches covered by the wheel in one second. With a 100-rpm motor and 7-inch wheel, the robot will travel at a top speed of 35.168 inches per second, or just under 3 feet per second. You can adjust the traveling speed of your robot by altering the diameter of its wheels. By reducing the diameter of the wheel by half, you reduce the traveling speed of the robot by half. Bear in mind that the actual travel speed, once the robot is all put together, may be lower than this. The heavier the robot, the larger the load on the motors, so the slower they will turn. Robot Channel, The 202421 http://www.therobotchannel.com/ Editorials and links about autonomous robots. RobotCombat.com 202978 http://www.robotcombat.com/ RobotCombat.com (operated by ro-battler Jim Smentowski) is a portal for robotics, where the specialty of the house is machines that bash up each other. A very useful feature is their continually updated links pages is: http://www.robotcombat.com/links.html ponents, and more. Check out the Projects page, which lists dozens of robot creations from contributors. Solarbotics.net 202030 http://www.solarbotics.net/ Solarbotics.net is a BEAM robotics community server, sponsored by the folks at Solarbotics (see http://www.solarbotics.com/). Here, you’ll find user- to-user forums, columns by BEAM fans, links to Web sites, design tips and pictures, videos of BEAM robots walking, rolling, or hopping about, and more. Portal-robotics 386 Nightmare, a robot built by Jim Smentowski, host of the RobotCombat.com portal. Photo Jim Smentowski. RobotGeeks.com 203462 http://www.robotgeeks.com/ News about robots. See also GoRobotics.net (this sec- tion). Robotics Online 202710 http://www.roboticsonline.com/ Robotic Industries Association online Web site. Robots.net 202409 http://www.robots.net/ Robots.net provides news on personal and industrial robotics, robot competitions, robotic sensors and com- Solarbotics.net portal page, for BEAM robot enthusiasts. Tech Geek 203454 http://www.techgeek.com/ A specialty portal all about “Building a robotic commu- nity.” Technopia: Robotics 203453 http://www.technocopia.com/robots.html News and views about robots and automation. TrueForce 203721 http://trueforce.com/ “The ultimate source of insight into robotics and automation.” G Power Transmission “Power transmission” is anything that transfers power or movement from one device to another. This category is quite large and encompasses gears, belts, chains, bearings, bushing, shafts, collars, retaining clips, ball bearings, and other components used in moving mech- anisms. Many sources for power transmission components also sell other materials of practical application for robots. Be sure to review all of the offerings of a given source as they may also provide something else you’ve been look- ing for. It’s not uncommon for sellers of power transmission components to provide you with lots of technical detail but no prices! This is common in the industrial supply business, where finding just the right part is more criti- cal than pricing. As amateur roboticists are typically long on dreams and short on cash, you’ll want to specif- ically ask for a pricing sheet so you can compare costs. The outfits that require you to speak with a sales repre- sentative for every price you want are probably not worth the effort. Skip to the next source. SEE ALSO: Actuators (various): Additional motion prod- ucts, including motors Fasteners: Used in machine construction, but also low-end linear actuators and other mechani- cal devices Machine Framing: Build frames and rails for robots Materials-Metal and Materials-Plastic: Substitute less-expensive general metal and plas- tic for some power transmission products Retail-Surplus Mechanical: An alternative source for overstocked and used components Suppliers-Casting & Mold Making: Cast your own gears and sprockets in plastic . . . yes, it can be done! Wheels and Casters: So your robot can move around Allied Devices 202122 325 Duffy Ave. Hicksville, NY 11801 USA (516) 935-1300 (516) 937-2499 info@allieddevices.com http://www.allieddevices.com/ Manufacturers and distributors of high-precision motion products and mechanical components. Offerings include: • Rotary motion assemblies (gearheads, speed reduc- ers, differentials) • Rotary motion components (shafts, couplings, shaft adapters) • Gears (including metric) • Linear motion assemblies (racks, pinions, linear slides, ACME screws and leadnuts) • Assembly hardware (screws, nuts, hangars, set screws, springs) x Bayside Automation Systems and Components 202478 27 Seaview Blvd. Port Washington, NY 11050 USA (516) 484-5353 (800) 305-4555 http://www.baysidemotion.com/ Precision motion products: bearings, linear-positioning slides, gear reducers, and servomotor amplifiers. x Bearing Belt Chain 203509 3501 Aldebaran St. Las Vegas, CA 89102 USA (702) 876-4225 (702) 364-0842 power transmission 387 Bearing Belt Chain Copyright 2003 by Gordon McComb. Click Here for Terms of Use. sales@bearing.com http://www.bearing.com/ Local and online retailer of bearings (linear, roller, taper, pillow, etc.), belts (including V and timing), sprockets, and chains. Large inventory. x V Bearing Headquarters Co. 204186 P.O. Box 6267 Broadview, IL 60155 USA (708) 681-4400 (708) 681-4462 http://bearingheadquarters.com/ Industrial bearings (all types), couplings, clutches, belt drives and rollers, gears, conveyor rolls and chain, sprockets, and chains. See also Headco Industries: http://www.headco.com/ Belt Corporation of America 202286 Dept L-12 3455 Hutchinson Rd. Cumming, GA 30040 USA (770) 887-4138 (800) 235-0947 sales@beltcorp.com http://beltcorp.com/ Belts, and not the kind you wear. BCA offers timing belts, woven endless belts (can be useful to construct robot tank treads), natural rubber and neoprene stretch belts, and countless round belts. Boca Bearing 204101 1500 S.W. 30th Ave #3 Boynton Beach, FL 33426 USA (561) 998-0004 (561) 998-0119 (800) 332-3256 bearing@gate.net http://www.bocabearings.com/ Boca specializes in small and miniature bearings for such applications as radio-control vehicles, inline skates, power tools, small appliances, fishing reels, and, of course, robotics. Bearings are listed by size, type, and general application. Be sure to check out their engineering section, which has some one dozen helpful technical backgrounders on using bearings. x V Boston Gear 202124 14 Hayward St. Quincy, MA 02171 USA (617) 328-3300 (617) 479-6238 (888) 999-9860 info@bosgear.com http://www.bostgear.com/ Gears, yes, but also bearings, transmissions, clutches, pneumatics, and assorted other power transmission and actuation products. Boston Gear also offers free litera- ture, maintenance manuals, and operating instructions for their products. x power transmission 388 Selection of gears. Courtesy Boston Gear. Helical gears. Courtesy Boston Gear. power transmission 389 Commonly Used Power Transmission Components There are literally thousands of power transmission components, but the following com- prise the most commonly used and the most critical. Gears Gears are a principle component of power transmission and are primarily used in robotics to reduce the speed and increase the torque of the wheel drive motors. Because of the mechanical precision required to properly mesh gears, most amateur robot builders do not construct their own gear assemblies. Gears are more fully detailed elsewhere in these sections. Timing Belts Also called synchronization belts. Typical timing belts for small mechanisms range from 1/8 to 5/18 inch in width and sizes from just a few inches to several feet in diameter. Material is usually neoprene, with metal or fiberglass rein- forcement. Belts are rated by the pitch between “nubs” or “cogs,” which are located on the inside of the belt. Timing belts are used with matching timing belt pulleys, which come with either ball bearing shafts (used for idler wheels) or with press-on or set screw shafts for attaching to motors and other devices. V-belts V-belts have a tapered V shape and are used to transfer motion and power from a motor to an output when synchronization of that motion is not critical (because the belt could slip). V-belts, which are often made with metal- or fiberglass-reinforced rubber, are used with V-grooved pulleys. By changing the diameter of the pulleys, it’s possible to alter the speed and torque of the output shaft in relation to the drive shaft. The same physics that apply to gears and gear sizes apply to V-belt pulleys as well. Endless Round Belts Endless round belts are used to transfer low-torque motion. The belts look like overgrown O-rings and, in fact, are often manufactured in the same manner. Other endless round belts are made by fusing the ends of rounded rubber (usually neoprene). Some belt mak- ers provide splicing kits so you can make custom belts of any length. Grooved pulleys are used with round belts; as with V-belt pulleys, the diameter of the round belt pulley can be altered to change the torque and speed of the output. Ladder Chain Ladder chain resembles the links of a ladder and is used for fairly low torque and slow speed operations. Movement of a robotic arm or shoulder is a good application for ladder chain. With most chain, links can be removed and added using a pair of pliers. Special toothed sprockets, engineered to match the pitch (distance from link to link) of the chain is used. Timing belts (or synchronization belts) use cogged belts and sprockets. Spur gears. power transmission 390 Roller Chain Roller chain is exactly the same kind as for bicycles, except for most small-scale machinery, the chain isn’t as big. Roller chain is available in miniature sizes, down to 0.1227-inch pitch (distance between links). More common is the #25 roller chain, which has 0.250-inch pitch. For reference, most bicycle chain is #50, or 0.50-inch pitch. Sprockets with matching pitches are used on the drive and driven compo- nents. Roller chain comes in metal or plastic; plastic chain is easier to work with and links can be added or removed. Many types of metal chains are prefabricated using hydraulic presses and require the use of “master links” to make a loop. Idlers Idlers (also called idler pulleys or idler wheels) take up slack in belt- and chain-driven mechanisms. The idler is placed along the length of the belt or chain and is positioned so that any slack is pulled away from the belt or chain loop. Not only does this allow more latitude in design, it also quiets the mechanism. The bores of the idlers are fitted with appropriate bearings or bushings. Couplers Couplers come in two styles • Rigid • Flexible Couplers are used to directly connect two shafts together, thus obviating the need for any kind of gear or belt. Rigid and flexible couplers are detailed more fully in these sections. Bearings Bearings are used to reduce the friction of a spinning component, such as a wheel or idler, around a shaft. Several bearing con- structions exist, with ball bearings being the most common. The bearing is com- posed of two concentric rings; between each ring is a row of ball bearings. The rings—and the ball bearings—are held in place by a mechanical flange of some type. Bearings can be mounted directly to a device, which requires precision machining and a press to securely insert the bearing into place. Another form of bearing uses narrow pieces of metal rod, called needles, and works in a similar manner. Pillow blocks are available that allow bearings to be readily mounted on any frame or device. Bushings Bushings and bearings serve the same general purpose, except a bushing has no moving parts. (Note: Some people also call these bearings or dry bearings, but I prefer to use the term bushing in order to differentiate them.) The bushing is made of metal or plastic and is engineered to be “self-lubricating.” Rigid coupler. Roller chain and sprocket. Flexible coupler. Ball bearing. Bearing in a pillow block. BRECOflex Co., LLC 203621 P.O. Box 829 Eatontown, NJ 07724 USA (732) 460-9500 (732) 542-6725 (888) 463-1400 info@brecoflex.com http://www.brecoflex.com/ Manufacturer of belts: timing belts, profiled belts, flat belts, pulleys, belt tensioners, and slider beds. Canadian Bearings Ltd. 203512 1401 Courtneypark Dr. E, Mississauga, Ontario L5T 2E4 Canada (905) 670-6700 (905) 670-2632 http://www.canadianbearings.com/ Motion mechanicals: bearings, brakes, bushings, cast- ers, clutches, motors, couplers, reducers, gears, sprock- ets, and conveyor belts. Locations across Canada. Cruel Robots 202533 32547 Shawn Dr. Warren, MI 48088 USA Dan@cruelrobots.com http://www.cruelrobots.com/ Performance materials and products for combat robots. Colson wheels (some are “combat ready” with heavy-duty hub already attached), axles, reducers, hubs, sprocket and chain, weapons, and casters. x V Danaher Motion MC 203507 45 Hazelwood Dr. Amherst, NY 14228 USA (716) 691-9100 (716) 691-9181 (800) 566-5274 http://www.danahermcg.com/ U.S based manufacturer and distributor of several top- quality motion product brands. See listing under Actuators. x David Price: On Bearings 202820 http://www.soton.ac.uk/~cds/bearings/ bearings.htm David gives us information about various kinds of mechanical bearings (plain bearings, ball bearings, roller bearings, thrust bearings) and how they are used in design. power transmission 391 An example is Oilite, a self-lubricated bronze metal com- monly found in industrial bushings. Several kinds of plastics, including Teflon, exhibit a self-lubricating property. Bushings are used instead of bearings to reduce cost, size, and weight and are adequate when friction between the moving parts can be kept relatively low. Bushings, and not the more expensive bearings, are used in the output gear of the less expensive R/C servos, for example. A self-lubricating bronze bushing. [...]... speeds1,000 feet per minute x $ x d V Bevel gears from Small Parts Photo Small Parts Inc Stock Drive Products 21 01 Jericho Tnpk Box 5 416 New Hyde Park, NY 11 04 2- 5 416 USA ( 516 ) 32 8-3 300 ( 516 ) 32 6-8 827 webmaster@sdp-si.com http://www.sdp-si.com/ Miniature sprocket and chain, from Serv-O-Link Photo ServO-Link, Corp Small Parts Inc 20 2486 20 2 12 0 13 980 N.W 58th Ct P.O Box 4650 Miami Lakes, FL 33 01 4-0 650...3 92 power transmission Drives, Incorporated 20 419 5 Electronics Parts Center 20 29 02 9 01 19th Ave Fulton, IL 6 12 5 2 USA ( 815 ) 58 9-4 420 (800) 43 5-0 7 82 custserv@drivesinc.com http://www.drivesinc.com/ 10 19 S San Gabriel Blvd San Gabriel, CA 917 76 USA ( 626 ) -2 8 6-3 5 71 (775) 25 7 -1 375 (800) 50 1- 9 888 http://www.electronicsic.com/ Drives, Incorporated makes... Products, Inc 20 3 319 P.O Box 18 8 Bessemer City, NC 28 016 USA (704) 73 9-7 463 (704) 73 9-5 566 (800) 75 2- 7 770 http://www.plastic-products.com/ d V NSK 86 Benson Rd P.O Box 10 04 Middlebury, CT 067 62 USA (20 3) 75 8-8 27 2 (20 3) 75 8-8 27 1 (800) 24 3-6 12 5 sales@pic-design.com http://www.pic-design.com/ V See listing under Tools x 20 2483 20 2 922 Plastic Products offers sheets, rods, tubes, profiles, shapes, slabs,... cheap, though your engineering selection is somewhat limited x Dura-Belt, Inc 20 418 5 29 09 Scioto-Darby Exec Ct Hilliard, OH 43 02 6-8 990 USA ( 614 ) 77 7-9 448 (800) 77 0 -2 358 durabelt@iwaynet.net http://www.durabelt.com/ x 20 3768 10 Hudson St Newark, NJ 0 710 3 -2 804 USA (973) 48 4 -1 11 9 (973) 48 4-7 790 (888) 48 4 -1 11 9 DynaVeyor@aol.com http://www.dyna-veyor.com/ Maker of plastic conveyor belt chain, sprockets, idlers,... Devices Ltd 20 3 513 40A Courtland Ave Concord, Ontario L4K 5B3 Canada (905) 76 1- 7 893 (905) 76 1- 6 24 2 (800) 26 5-5 304 http://www.rgspeed.com/ Gears, bearings, bushings, actuators, stepper motors, and motor controllers V 400 power transmission RMB Roulements Miniatures SA 20 4 011 Eckweg 8 Box 6 12 1 CH -2 5 00 Biel-Bienne 6 Switzerland + 41 32 344 4300 + 41 32 344 43 01 info@rmb-group.com http://www.rmb-ch.com/ SEE... Equipment Co 20 2606 28 00 Southcross Dr West Burnsville, MN 55306 USA (9 52) 89 4-9 510 (9 52) 89 4 -1 020 (800) 22 1- 0 516 http://www.northerntool.com/ 38 61 Research Park Dr P.O Box 15 07 Ann Arbor, MI 4 810 6 -1 507 USA Precision mechanical components, motion control mechanicals, X-Y translation tables, leadscrews, belts, pulleys, and gear products Plastic Products, Inc 20 3 319 P.O Box 18 8 Bessemer City, NC 28 016 USA... variety of power transmission items Good assortment of technical info x V Minarik Corporation 20 3 510 905 East Thompson Ave Glendale, CA 9 12 0 1 USA ( 818 ) 63 7-7 500 ( 818 ) 63 7-7 509 (800) 42 7 -2 757 http://www.minarikcorp.com/ x 20 4 015 Unit 4, 22 4 Wishart Rd Wishart, Queensland 4 12 2 Australia + 61 7 3349 14 00 + 61 7 3349 38 01 sales@minibearings.com.au http://www.minibearings.com.au/ Miniature bearings and other mechanicals... 33 513 USA (3 52) 79 3-9 600 (3 52) 79 3-4 027 (800) 96 2- 4 10 8 Info@TSRacing.com http://www.tsracing.com/ Go-kart and motorbike racing supplies, also suitable for use for robots (racing or non): bearings, axles, sprockets, sprocket hubs, wheels ( 5- and 6-inch diameter), and assorted mechanical parts x V Vaughn Belting 20 3 622 20 0 Northeast Dr Spartanburg, SC 29 304 USA (864) 57 4-0 23 4 (864) 57 4-4 25 8 Flexible... of whack from one another, and yet they won’t tear each other apart x V Maryland Metrics 20 410 5 P.O Box 26 Owings Mills, MD 21 11 7-0 26 1 USA ( 410 ) 35 8-3 13 0 ( 410 ) 35 8-3 1 42 (800) 63 8 -1 830 sales@mdmetric.com http://www.mdmetric.com/ Something of a one-stop shop, Maryland Metrics carries bearings, linear bearings, fasteners, rods, gears, pneu- 396 power transmission matic and hydraulic fittings, and a variety... virtual robots V 20 3376 414 Programming-robotic simulations Cyberbotics 20 3 723 Cyberbotics S.r.l Ch de Vuasset CP 98 1 028 Prverenges Switzerland + 41 21 693 8 624 + 41 21 693 8 624 info@cyberbotics.com www.cyberbotics.com http://www.cyberbotics.com/ Another unique aspect is the database includes the approximate price and sources for the motors x V GNU Robots 20 418 9 http://www.gnu.org/software/robots/ Publishers . from Small Parts. Photo Small Parts Inc. Stock Drive Products 20 2486 21 01 Jericho Tnpk. Box 5 416 New Hyde Park, NY 11 04 2- 5 416 USA ( 516 ) 32 8-3 300 ( 516 ) 32 6-8 827 webmaster@sdp-si.com http://www.sdp-si.com/ If. in the design of tracked robots. x Electronics Parts Center 20 29 02 10 19 S. San Gabriel Blvd. San Gabriel, CA 917 76 USA ( 626 ) -2 8 6-3 5 71 (775) 25 7 -1 375 (800) 50 1- 9 888 http://www.electronicsic.com/ Specializes. hobbyist. x V Motion Industries 20 3508 16 05 Alton Rd. Birmingham, AL 3 520 1- 1 477 USA (20 5) 95 6 -1 12 2 (800) 52 6-9 328 http://www.motion-industries.com/ Full-line distributor/retailer of industrial
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