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( Moving parts)
Moving parts are the components of a device that undergo continuous or frequent motion, most commonly rotation. "Parts" only include the mechanical components which does not include fuel, or any other gas or liquid. The moving parts of a machine are by far the most common cause of failures because they receive the most wear and tear.[citation needed] Because of this most designers attempt to reduce the number of moving parts. Devices with no moving parts produce less noise, less vibration and are more reliable, when compared with mechanical counterparts. For example, the computer industry replaced relay-based circuits with vacuum tubes. Early television devices which used mechanical scanning disks were also replaced with electronic rasterizers solutions. Other examples include
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