vb.net barcode reader tutorial BUILDING A WOODEN MOTORIZED PLATFORM in Software

Maker QR Code ISO/IEC18004 in Software BUILDING A WOODEN MOTORIZED PLATFORM

9.5 BUILDING A WOODEN MOTORIZED PLATFORM
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8/32 Nut (Length determined by thickness of wood block)
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Flat Washer Tooth Lockwasher Nut
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Motor
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Top View
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FIGURE 9-4 One way to secure the motors to the base is to use a wood block hollowed out to match the shape of the motor casing. a. Side view; b. Top view.
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turn by stopping or reversing one motor while the other continues turning. Attach the caster using four 8 32-by-1-in bolts. Secure the caster with tooth lock washers and 8 32 nuts. The caster should be mounted so that the robot base is level and it can swivel with a minimum of resistance. You may, if necessary, use spacers to increase the distance from the base plate of the caster to the bottom of the platform. If the caster end of the robot is much higher than the wheels, then the motor mounting bolts or the rear of the robot might rub on the ground. If this is the case, you should be looking at using a smaller caster, larger wheels, or mounting the motors on the bottom of the robot base.
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9.5.3 BATTERY HOLDER
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You can purchase battery holders that contain from one to six dry cells in any of the popular battery sizes. When using 6-V motors, you can use a four-cell D battery holder. You can
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WOODEN PLATFORMS
Motors and DriveWheels
Caster
Bottom
1" x 8/32 Bolt
Platform
Tooth Lockwasher Nut Caster
FIGURE 9-5 Attaching the caster to the platform. a. Top and bottom view; b. caster hardware assembly detail.
also use a single 6-V lantern or rechargeable battery. Motors that require 12 V will need two battery holders, two 6-V batteries, or one 12-V battery (motorcycle batteries are often excellent power sources for robots, which require 12 V and a fair amount of current). For the prototype, 6-V motors and a four-cell D battery holder were used. Secure the battery holder(s) to the base with 8 32 nuts and bolts. Drill holes to accommodate the hardware. Be sure the nuts and bolts don t extend too far below the base or they may drag when the robot moves. Likewise, be sure the hardware doesn t interfere with the batteries. Wire the batteries and wheels to the DPDT through control switches, as shown in the Minibot project described at the end of 8, Plastic Platforms. One switch controls the left motor; the other switch controls the right motor.
9.6 FROM HERE
9.6 From Here
To learn more about . . . Plastic robots Metal robots Using batteries Selecting the right motor Using a computer or microcontroller Read 8, Plastic Platforms 10, Metal Platforms 17, All about Batteries and Robot Power Supplies 19, Choosing the Right Motor for the Job 12, An Overview of Robot Brains
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CHAPTER
METAL PLATFORMS
FIGURE 10-1 The completed Buggybot.
etal is perhaps the best all-around material for building robots because it offers better strength than other materials. If you ve never worked with metal before, you shouldn t worry; there is really nothing to it. The designs outlined in this chapter and the chapters that follow will show you how to construct robots both large and small out of readily available metal stock, without resorting to welding or custom machining.
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METAL PLATFORMS
10.1 Working with Metal
If you have the right tools, working with metal is only slightly harder than working with wood or plastic. You ll have better-than-average results if you always use sharpened, wellmade tools. Dull, bargain-basement tools can t effectively cut through aluminum or steel stock. Instead of the tool doing most of the work, you do.
10.1.1 MARKING CUT LINES AND DRILL HOLE CENTERS
Marking metal for cutting and drilling is more difficult than other materials due to its increased hardness and resistance to being permanently marked by inks. Professional metal workers scratch marking lines in metal using a tool called a scratch awl; it can be purchased at hardware stores for just a few dollars. You ll find that when you drill metal the bit will skate all over the surface until the hole is started. You can eliminate or reduce this skating by using a punch prior to drilling. There are spring-loaded punches that simply require you to press down on them before they snap and pop a small indentation in the material. You can also buy punches that require a hammer to make the indentation, but the spring-loaded ones are easier to work with and do not cost a lot more.
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