Rotary reciprocation
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The action in which a body's displacement returns to its starting location in a given time repeatedly in a Rotary axis but without traversing a full rotation, ie back and forth not round and round. The velocity over which the displacement occurs with each repetition not necessarily being constant. Such an action is usually used to describe quickly moving implements in mechanical objects within a Rotary Axis, or even in complex Rotary displacement/velocity paths.
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