vb.net barcode reader I Large LEGO balloon tires have a recessed hub that exactly fits the control disc in Software

Generator Data Matrix 2d barcode in Software I Large LEGO balloon tires have a recessed hub that exactly fits the control disc

I Large LEGO balloon tires have a recessed hub that exactly fits the control disc
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included with Hitec and many other servos. You can simply glue the disc into the rim of the tire. I Lightweight foam tires, popular with model airplanes, can be glued or screwed to the control disc. The tires are available in a variety of diameters. If you wish, you can grind down the hub of the tire so it fits smoothly against the control disc.
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Shaft attached to servo disc
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Servo disc
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FIGURE 20.11 Servos can be used to transform rotational motion to linear motion.
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MOUNTING SERVOS ON THE BODY OF THE ROBOT 315
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I A gear glued or screwed into the control disc can be used as an ersatz wheel or as a gear
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that drives a wheel mounted on another shaft. In all these cases, it s important to maintain access to the screw used to secure the control disc to the servo. When you are attaching a wheel or tire be sure not to block the screw hole. If necessary, insert the screw into the control disc first, then glue or otherwise attach the tire. Make sure the hub of the wheel is large enough to accept the diameter of your screwdriver, so you can tighten the screw over the output shaft of the servo.
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Mounting Servos on the Body of the Robot
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Servos should be securely mounted to the robot so the motors don t fall off while the robot is in motion. In my experience, the following methods do not work well, though they are commonly used:
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I Duct tape or electrical tape. The goo on the tape is elastic, and eventually the servo
works itself lose. The tape can also leave a sticky residue.
FIGURE 20.12 Attaching a round control disc to the hub of a wheel.
316 WORKING WITH SERVO MOTORS
I Hook-and-loop, otherwise known as Velcro. Accurate alignment of the hook-and-loop
halves can be tricky, meaning that every time you remove and replace the servos the wheels are at a slightly different angle with respect to the body of the robot. This makes it harder to program repeatable actions. I Tie-wraps. You must cinch the tie-wrap tightly in order to adequately hold the servo in place. Unless your robot is made of metal or strong plastic, you re bound to distort whatever part of the robot you ve cinched the wrap against. Over the years, I ve found hard mounting gluing, screwing, or bolting the servos onto the robot body to be the best overall solution, and it greatly reduces the frustration level of hobby robotics.
ATTACHING SERVOS WITH GLUE
Gluing is a quick and easy way to mount servos on most any robot body material, including heavy cardboard and plastic. Use only a strong glue, such as two-part epoxy or hotmelt glue. I prefer hot-melt glue because it doesn t emit the fumes that epoxy does, and it sets much faster (about a minute in normal room temperatures versus a minimum of five minutes for fast-setting epoxy). When gluing it is important that all surfaces be clean. Rough up the surfaces with a file or heavy-duty sandpaper for better adhesion. If you re gluing servos to LEGO parts, apply a generous amount so the extra adequately fills between the nubs. LEGO plastic is hard and smooth, so be sure to rough it up first.
ATTACHING SERVOS WITH SCREWS OR BOLTS
A disadvantage of mounting servos with glue is that it s more or less permanent (and, according to Murphy s Law, more permanent than you d like if you want to remove the servo, less permanent if you want the servo to stay in place!). For the greatest measure of flexibility, use screws or bolts to mount your servos to your robot body. All servos have mounting holes in their cases; it s simply a matter of finding or drilling matching holes in the body of your robot. Servo mounts are included in many R/C radio transmitters and separately available servo sets. You can also buy them separately from the better-stocked hobby stores. The servo mount has space for one, two, or three servos. The mount has additional mounting holes that you can use to secure it to the side or bottom of your robot. Most servo mounts are made of plastic, so if you need to make additional mounting holes they are easy to drill. You can also construct your own servo mounting brackets using 1/8-inch thick aluminum or plastic. A template is shown in Fig. 20.13. (Note: the template is not to scale, so don t trace it to make your mount. Use the dimensions to fashion your mount to the proper size.) The first step in constructing your own servo mounting brackets is to cut and drill the aluminum or plastic, as shown in Fig. 20.13. Use a small hobby file to smooth off the edges and corners. The mounting hole centers provided in the template are designed to line up with the holes in LEGO Technic beams. This allows you to directly attach the servo mounts to LEGO pieces. Use 3/32 or 4/40 nuts and bolts, or 4/40 self-tapping screws, to attach the servo mount to the LEGO beam.
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