vb.net barcode reader source code Teeth 1200 r/min 60 Teeth 30 Teeth 800 r/min 400 r/min 25 Teeth 960 r/min 40 Teeth 480 r/min in Software

Encoding QR-Code in Software Teeth 1200 r/min 60 Teeth 30 Teeth 800 r/min 400 r/min 25 Teeth 960 r/min 40 Teeth 480 r/min

20 Teeth 1200 r/min 60 Teeth 30 Teeth 800 r/min 400 r/min 25 Teeth 960 r/min 40 Teeth 480 r/min
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FIGURE 19-7 Gears driven by the 20-tooth gear on the left rotate at different speeds, depending on their diameter.
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19.6 GEARS AND GEAR REDUCTION
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You can reduce the speed of a motor in steps by using the arrangement shown in Fig. 19-8. Here, the driver gear turns a larger hub gear, which in turn has a smaller gear permanently attached to its shaft. The small hub gear turns the driven gear to produce the final output speed, in this case 50 r/min. You can repeat this process over and over again until the output speed is but a tiny fraction of the input speed. This is the arrangement most often used in motor gear reduction systems.
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19.6.3 USING MOTORS WITH GEAR REDUCTION
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It s always easiest to use DC motors that already have a gear reduction box built onto them, such as the motor in Fig. 19-9. R/C servo motors already incorporate gear reduction, as do most stepper motors. This fact saves you from having to find a gear reducer that fits the motor and application and attach it yourself. When selecting gear motors, you ll be most interested in the output speed of the gearbox, not the actual running speed of the motor. Note as well that the running and stall torque of the motor will be greatly increased. Make sure that the torque specification on the motor is for the output of the gearbox, not the motor itself. With most gear reduction systems, the output shaft is opposite the input shaft (but usually off center). With other boxes, the output and input are on the same side of the box. When the shafts are at 90 degrees from one another, the reduction box is said to be a right-angle drive. If you have the option of choosing, select the kind of gear reduction that best suits the design of your robot. You will probably find that shafts on opposite sides is the all-around best choice. Right-angle drives also come in handy, but they usually carry high price tags. When using motors without built-in gear reduction, you ll need to add reduction boxes, such as the model shown in Fig. 19-10, or make your own. Although it is possible to do both of these yourself, there are many pitfalls:
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12-Tooth Driver (1000 r/min)
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FIGURE 19-8 True gear reduction is achieved by ganging gears on the same shaft.
CHOOSING THE RIGHT MOTOR
FIGURE 19-9 A motor with an enclosed gearbox. These are ideal for robotics use.
FIGURE 19-10 A gear reduction box, originally removed from an open-frame AC motor. On this unit, the input and output shafts are on the same side.
19.6 GEARS AND GEAR REDUCTION
Shaft diameters of motors and ready-made gearboxes may differ, so you must be sure that the motor and gearbox mate. Separate gear reduction boxes are hard to find. Most must be cannibalized from salvage motors. Old AC motors are one source of surplus boxes. When designing your own gear reduction box, you must take care to ensure that all the gears have the same hub size and that meshing gears exactly match each other. Machining the gearbox requires precision, since even a small error can cause the gears to mesh improperly.
19.6.4 ANATOMY OF A GEAR
Gears consist of teeth, but these teeth can come in any number of styles, sizes, and orientations. Spur gears are the most common type. The teeth surround the outside edge of the gear, as shown in Fig. 19-11. Spur gears are used when the drive and driven shafts are parallel. Bevel gears have teeth on the surface of the circle rather than the edge. They are used to transmit power to perpendicular shafts. Miter gears serve a similar function but are designed so that no reduction takes place. Spur, bevel, and miter gears are reversible. That is, unless the gear ratio is very large, you can drive the gears from either end of the gear system, thus increasing or decreasing the input speed. Worm gears transmit power perpendicularly, like bevel and miter gears, but their design is unique. The worm (or lead screw) resembles a threaded rod. The rod provides the power.
FIGURE 19-11 Spur gears. These particular gears are made of nylon and have aluminum hubs. It s better to use metal hubs in which the gear is secured to the shaft with a setscrew.
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