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In Mechanical Engineering , a clockwork is either a lightweight mechanical Linkage , especially one involving multiple axles, or a complete mechanical device whose functioning relies on internal clockwork (in the preceding sense), especially where muscular effort is the sole source of operating power. Often power for the device is stored within it via a winding device that applies mechanical stress to an energy-storage mechanism such as a Spring , thus involving some form of Escapement ; in other cases, hand power may be utilized as it is applied. The use of wheels, whether linked by Friction or Gear teeth, to redirect motion or gain speed or Torque , is typical; many clockworks have been constructed primarily to serve as visible or implicit ''tours de force'' of mechanical ingenuity in this area. Clockwork can also describe an action that is repeated in uniform order over and over, for example 'The postman does his rounds like clockwork every day.' EXAMPLES The most common examples are mechanical Clock s - hence the name. Others include:
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