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Tham khảo tài liệu 'lego mindstorms - robotics invention system-2 projects part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Robot 1 The Bug Motor Step 6 Using the vertical beam to lock the 1x4 and 1x8 horizontal beams together is called cross bracing. Cross bracing makes this assembly very strong. The height of the 1x4 beam 1.2 studs and two plates 0.4 studs multiplied by two places the pins two studs apart this is just the right spacing to have them line up with holes in the vertical beam. Knowing how to use combinations of plates and beams to make the holes in horizontal and vertical beams line up is an important LEGO building skill. Remember you will need to build two of these. The Right Wheel Now it s time to add the wheel and gearing to the motor mount. Robot 1 The Bug Right Wheel Step 0 The pulley wheels act as a spacer to prevent the rubber tire from rubbing against the motor mount. They also act as a bearing to carry some of the weight of the robot. A bushing could do the same thing but the pulley wheel spreads the weight out over a larger area. This makes it less likely that the forces will Right Wheel Step 1 damage the robot. Right Wheel Step 2 The yellow plate is on the bottom and to the right of the gray TECHNIC plate. It s used here because there are not enough 2x4 TECHNIC plates. It also adds a nice splash of color to the otherwise gray-and-black assembly. 12 Robot 1 The Bug Right Wheel Step 3 The 8t spur gear mates to the worm gear in the motor mount providing an 8 1 gear reduction. Thus the motor has to spin eight revolutions for the wheel to rotate just once. Gear reduction increases the torque output of the motor. The axle attached to the wheel may turn eight times slower than the motor shaft but it also turns almost eight times stronger. Right Wheel Step 4 Locate one of the motor mount sub-assemblies that you built earlier. Slide the motor mount sub-assembly onto the axle and secure the mount onto the axle with the two stop .
