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Maker QR Code in Software Copyright 2006, 2001, 1987 by The McGraw-Hill Companies, Inc. Click here for terms of use.

Copyright 2006, 2001, 1987 by The McGraw-Hill Companies, Inc. Click here for terms of use.
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11.1 A Variety of Construction Sets
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Toy stores are full of plastic put-together kits and ready-made robot toys that seem to beg you to use them in your own robot designs. Here are some toys you may want to consider for your next project.
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11.1.1 ERECTOR SET
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The Erector set, now sold by Meccano, has been around since the dawn of time or so it seems. The kits, once made entirely of metal but now commonly including many plastic pieces, come in various sizes and are generally designed to build a number of different projects. Many kits are engineered for a specific design with perhaps provisions for moderate variations. Among the useful components of the kits are prepunched metal girders, plastic and metal plates, tires, wheels, shafts, and plastic mounting panels. You can use any as you see fit, assembling your robots with the hardware supplied with the kit or with 6 32 or 8 32 nuts and bolts. Several Erector sets, such as those in the action troopers collection, come with wheels, construction beams, and other assorted parts that you can use to construct a robot base. Motors are typically not included in these kits, but you can readily supply your own. Because Erector set packages regularly come and go, what follows is a general guide to building a robot base. You ll need to adapt and reconfigure based on the Erector set parts you have on hand. The prepunched metal girders included in the typical Erector set make excellent motor mounts. They are lightweight enough that they can be bent, using a vise, into a U-shaped motor holder. Bend the girder at the ends to create tabs for the bolts, or use the angle stock provided in an Erector set kit. The basic platform is designed for four or more wheels, but the wheel arrangement makes it difficult to steer the robot. The design presented in Fig. 11-1 uses only two wheels. The platform is stabilized using a miniature swivel caster at one end. You ll need to purchase the caster at the hardware store. Note that the shafts of the motors are not directly linked to the wheels. The shaft of the wheels connects to the base plate as originally designed in the kit. The drive motors are equipped with rollers, which engage against the top of the wheels for traction. You can use a metal or rubber roller, but rubber is better. The pinch roller from a discarded cassette tape player is a good choice, as is a 3 8-in beveled bibb washer, which can be found in the plumbing section of the hardware store. You can easily mount a battery holder on the top of the platform. Position the battery holder in the center of the platform, toward the caster end. This will help distribute the weight of the robot. The basic platform is now complete. You can attach a dual-switch remote control, as described earlier in the book, or automatic control circuitry as will be outlined in later chapters. Do note that over the years the Erector set brand has gone through many owners. Parts from old Erector sets are unlikely to fit well with new parts. This includes but is not limited to differences in the threads used for the nuts and bolts. If you have a very old Erector set (such as those made and sold by Gilbert), you re probably better off keeping them as collector s items rather than raiding them for robotic parts. The very old Erector sets of the 1930s through 1950s fetch top dollar on the collector s market (when the sets are in good, complete condition, of course).
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