Servos, originating from their application in model building, are usually used to operate arms, feet and other 'tools' of a robot. In addition to these obvious uses they are also very suitable as a motor to drive the wheels of a robot, for example. To do this, the standard servo does need to be modified first however.
Servos have been used for a long time in the model construction arena. As a result they are readily available and often at attractive prices.
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