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A worm gear meshed with a 24-tooth spur gear in a technic gear box 30 CHAPTER 2 ■ CHASSIS DESIGN Clutch Gears Clutch gears (see Figure 2–9) are special because they are designed to allow the axle to rotate around the gear when the maximum allowable torque is applied to the gear. They contain an internal clutch that will slip and no longer move with the axle once the maximum force is applied. cm” printed on the front of it; this is the torque rating for the gear. The clutch gears are useful for saving motors and keeping your robot from breaking or tearing up itself when too much torque is applied to the gear.

Again, this doesn’t have to be anything detailed or complicated at this point; just a simple sketch is good. Once everyone has their ideas ready, they present them to the group. Each team member needs to not only show his or her diagrams but also explain why this design could be the winning design. When presenting the design to the team, be sure to include key points about the design that coincide with the mission task laid out earlier by the team. Also, be sure the design follows the event rules that you learned.

Sometimes, gears seem to fit together but are causing too much friction because they’re meshing too tightly with the other gears. Also, check all your bushings to ensure that none of them are pressing against the chassis too tightly. Wheel rub is another thing to check; if you don’t put the correct spacers on the backs of your wheels, the wheels tend to slide some during practice and could rub your chassis and cause friction. 42 CHAPTER 2 ■ CHASSIS DESIGN These are LEGO robots, and parts will move around even when you don’t want them to.

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Электронная структура и свойства твердых тел

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