By Janusz Ledwoch
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Extra resources for Bf-110
And over time, the axle itself will begin to bend, thus making the robot’s performance even more unpredictable. 35 CHAPTER 2 ■ CHASSIS DESIGN Figure 2–17. Single bushing spacing on wheel axle Figure 2–18. Multiple bushing spacing on a wheel axle, moving the wheel further from the chassis causing more friction The most dependable solution is to have a chassis that fully supports the wheel axle on both ends, giving maximum support the wheel and axle and removing a great deal of friction on the it; see Figure 2– 19.
In Chapter, 4 we will talk about steering techniques in greater detail. Two-Wheeled Robots One of the simplest designs is the two-wheeled robot design shown in Figure 2–20. This consists of two wheels, each attached to its own motor, with some kind of skids or ball casters to help the robot keep its balance. Depending on the game field, these designs can actually do very well in FLL events. Many times, the simple designs perform the best. 37 CHAPTER 2 ■ CHASSIS DESIGN The center of gravity can be a concern with two-wheeled robots just because the wheels tend to be close to the front, and once any attachments are connected, this can cause the robots to fall forward.
I’ve seen many LEGO gears and axles twisted and snapped from being having too much torque applied. Speed No one wants a slow robot; we all love build things that go fast. 5 minutes to complete as many missions as you can, so speed is important. But remember: in gaining speed, the effectiveness of other design principles, such as power and size, will be sacrificed. It’s not easy for a big robot to go fast. Also with speed, the risk of mistakes can increase; it’s easy for a speedy robot to miss goals.