Engineers have invented some ingenious machines, and Gears are one of the greatest! You will be amazed when you realize how many of our equipment used today rely on these machine elements. Gears can easily reduce or increase speed, change Force, or transfer motion from one position to another. Various types of Gears exist, and the major ones are introduced in this package; ordinary Gears, crown gears, worm and rack gears, all in this handy box. In addition, the concept of Screws is presented, closely related to the worm gear function. Models such as a hand drill, an egg beater, moving cranes, a rotating sign post, a screw press, a folding lifting platform and much more may be created. Detailed instructions for 10 models are included.
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