vb.net read barcode from camera ADHESIVES in Software

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3.6.6 ADHESIVES
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Adhesives is a ten-dollar word to describe glues. While many people dismiss glues as not being appropriate for use in robots, by following a few simple rules (namely keep the surfaces to be glued together clean, and rough them up with sandpaper to give more surface area for the glue to hold onto), they can be as effective as any of the other methods presented in this chapter and can be a lot easier to work with. Table 3-2 lists a number of the most commonly used adhesives and some of their characteristics and uses.
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3.6.7 MISCELLANEOUS METHODS
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While the list of fastening methods in the previous sections seems comprehensive, there are still a number of different methods that you can use to hold your structural parts together that are useful in a variety of different applications. The following list describes methods used on different robots that have resulted in structures that are stronger, lighter, and easier to build than using the traditional methods previously described. Some of these suggested fastening methods may seem fanciful, but remember to never say never there are situations where each one of these solutions will be optimal.
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Welding is useful for large heavy robots built on a steel frame or chassis. With the proper tools and training, robot structures can be precisely assembled quite quickly. Training is critical as all types of welding can be dangerous. Oxyacetylene torches can also be used for heating up and bending steel parts but only if you know what you are doing. The next time you open a car s hood to look in the engine compartment, take a look at
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STRUCTURAL MATERIALS
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TABLE 3-2 ADHESIVE Weldbond
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Adhesives and the Materials They Are Designed For MATERIALS Wood/PCB COMMENTS Excellent for tying down loose wires and insulating PCBs Melts plastics together Best for locking nuts Works best on unfinished wood Very permanent Good for bonding paper/laminates to wood or each other Good for holding components onto robot structure. Can leave residue during removal. Not recommended due to poor vibration tolerance
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Solvents Krazy Glue/Locktite Carpenter s glue 5-minute epoxy Contact cement
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Plastics Metal/Plastic Wood Everything Flat, Porous
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Two-sided tape
Smooth surface
Hot glue gun
Everything
the myriad of fasteners in there. Cable ties and hose clamps are generally specialty items, but chances are you will run across a few applications that are helpful to the robots you are working on. Nothing has been written to say that robot structures have to be permanently fastened together. If you are unsure about the best configuration for the parts of your robot or if different parts are needed for multiple robots, why don t you mount them with velcro, magnets, or in a way that allows them to be removed and replaced quickly and easily. There are a number of robots that are held together by steel cables and turnbuckles (threaded cable connectors that can be used to adjust the tension on a cable). These robots definitely have a unique look and can be made very light and very rigid. Finally, why do the parts have to be fastened together at all A robot built from interlocking parts could be particularly fascinating and an interesting response to the need for coming up with robot components that can be taken apart and put back together in different ways. Electrical connections made when the parts are assembled together could provide wiring for the robot and prevent invalid configurations from being created.
3.7 SCAVENGING: MAKING DO WITH WHAT YOU ALREADY HAVE
3.7 Scavenging: Making Do with What You Already Have
You don t always need to buy new (or used or surplus) to get worthwhile robot parts. In fact, some of the best parts for hobby robots may already be in your garage or attic. Consider the typical used VCR, for example. It ll contain at least one motor (and possibly as many as five), numerous gears, and other electronic and mechanical odds and ends. Depending on the brand and when it was made, it could also contain belts and pulleys, appropriate motor drivers, digital electronics chips, infrared receiver modules, miniature push buttons, infrared light-emitting diodes and detectors, and even wire harnesses with multipin connectors. Any and all of these can be salvaged to help build your robot. All told, the typical VCR may have over $50 worth of parts in it. Never throw away small appliances or mechanical devices without taking them apart and looking for usable parts. If you don t have time to disassemble that CD player that s skipping on all of your compact discs, throw it into a pile for a rainy day when you do have a free moment. Ask friends and neighbors to save their discards for you. You d be amazed how many people simply toss old VCRs, clock radios, and other items into the trash when they no longer work. Likewise, make a point of visiting garage sales and thrift stores from time to time, and look for parts bonanzas in used and perhaps nonfunctioning goods. Scout the local thrift stores (Goodwill, Disabled American Veterans, Salvation Army, Amvets, etc.) and for very little money you can come away with a trunk full of valuable items that can be salvaged for parts. Goods that are still in functioning order tend to cost more than the broken stuff, but for robot building the broken stuff is just as good. Be sure to ask the store personnel if they have any nonworking items they will sell you at a reasonable cost. Here is just a short list of the electronic and mechanical items you ll want to be on the lookout for and the primary robot-building components they have inside.
VCRs are perhaps the best single source for parts, and they are in plentiful supply (hundreds of millions of them have been built since the mid-1970s). As previously discussed, you ll find motors (and driver circuits), switches, LEDs, cable harnesses, and IR receiver modules on many models. CD players have optical systems you can gut out if your robot uses a specialty vision system. Apart from the laser diode, CD players have focusing lenses, miniature multicell photodiode arrays, diffraction gratings, and beam splitters, as well as micro-miniature motors and a precision lead-screw positioning device (used by the laser system to read the surface of the CD). Old disk drives (floppy and hard drives) also have a number of components that are very useful in robots. Along with the motor that turns the disk, the stepper motor that moves the head is well suited for use in robot arms or even small walking robots. Later in the book, opto-interrupters will be discussed and the typical disk drive has at least two of these that could be used in a robot. Fax machines contain numerous motors, gears, miniature leaf switches, and other mechanical parts. These machines also contain an imaging array (it reads the page to fax it) that you might be able to adapt for use as robotic sensors.
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