1) Spur Gear-Parallel and co-planer shafts connected by gears are called spur gears. The arrangement is called spur gearing. Spur gears have straight teeth and are parallel to the axis of the wheel. Spur gears are the most common type of gears. The advantages of spur gears are their simplicity in design, economy of manufacture and maintenance, and absence of end thrust.
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An affinity group is a small group of people who support each other and work together to change the world. Social activism can be tough work. Acting alone, we may feel powerless to create real change. An affinity group can provide practical support as well as inspiration, motivation, and fun. Your affinity group might work together to prepare for a particular direct action or campaign, or it might stick together for years. Support and community. Americans are increasingly isolated.