asp.net barcode reader Figure 8 1. DemoBot with a flat bumper installed in Font

Encoding ECC200 in Font Figure 8 1. DemoBot with a flat bumper installed

Figure 8 1. DemoBot with a flat bumper installed
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Plow
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Unlike a bumper, where you want to push an object forward, you may have the need to push something out of your way or possibly clear a path. If this is the case, you don t want a flat bumper that meets the object perpendicularly; you need something that will make impact and then push the object clear of the robot s path. Think of a snow plow; the blade on a snow plow is at an angle, and as the snow is pushed, it goes off to the side. The simple motion of the plow truck and the shape of the plow blade make this happen. The very same principle can be applied with a LEGO robot. Just build your bumper with an angle that will move the object without much force. Depending on the object you are trying to move, the size of the angle and the force needed will differ. Don t be afraid to experiment and try different designs. Be sure to take notes of the different designs you try and include the findings in your technical documentation that you present to any design judges at your event. Being able to document why your team built something the way that you did is always good in the judge s eyes. Your plow should have a smooth face on it as well. Don t just take a LEGO plate with studs facing forward and expect your target object to move out of the way. You want to minimize the friction by having a nice smooth surface on your plow. If you do use a LEGO plate, be sure to add some LEGO tiles to it so that any studs facing out don t cause objects to get caught or not move as you expected. The plow in Figure 8 2 keeps the smooth side of the TECHNIC beams exposed so that any objects that make contact will slide out of the way.
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CHAPTER 8 PASSIVE ATTACHMENTS
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Figure 8 2. DemoBot with plow for pushing objects out of the path of the robot
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Delivery Box
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Maybe instead of trying to make contact with a field object you re trying to deliver some objects on the field. You could try to build a complicated claw or attachment that contains the objects and then opens up to release them, but many times, a simple delivery box will do. In Figure 8 3, the robot is using a foursided box to deliver the ball; without the box, the ball could roll away from the robot. In the FLL 2008 Climate Connections game, many objects had to be delivered to particular places on the field. The rules stated that the objects must be making contact with the field mat but there were no rules against containing or corralling the object in a box made from LEGO bricks. In order to keep with the rules about making contact with the game mat, you simply built a LEGO box that had four sides but no bottom. The great part about this was that you just had to drop the pieces into the box that needed to be delivered and then push the box along the game field to the desired location. No special arms or fancy attachments were needed on the robot, just a way to push the box. You could have had something as easy as a bumper or something with a little more design effort that would hold the delivery box on three sides but allow the box to be release when the robot went in reverse. Just a bumper with three sides that fit around the box would be perfect and could possibility be reusable for other task as well.
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CHAPTER 8 PASSIVE ATTACHMENTS
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Figure 8 3. A bottomless box being pushed into place with a simple bumper attachment
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Note Attachments that can be used for more than one task not only save you design time but can also save your team lots of competition time by avoiding the need to change out attachments.
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When you build a delivery box think about how the box will travel across the game field. You will want the box to have as little friction with the mat as possible. You could put some tiny wheels on the box, but then you run the risk of having trouble if the robot needs to make turns while making the delivery, since the wheels on the box are not going to steer with your robot (they will simply skid). Adding some skids to the box would be a better idea, anything that is smooth and slides easy on the mat surface. Here you can be creative; try using TECHNIC beams on their sides or some LEGO tiles attached to the bottom of your box. Don t be afraid to use parts you would never have thought would be handy in LEGO robots events. I ve seen LEGO minifig snow skis used, and they slid across the game field well. Again, just like with the plow attachment, don t be afraid to try different idea and test them out. Just be sure that you document everything so that you can show design judges how your solutions came about.
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