The motorized spindle is usually used in the CNC machine, however, the mechanical spindle is used in the general machine tools.
The motorized spindle occurred in the field of CNC machine tools area in recent years, it is a new technology which integrates the machine tool spindle and the spindle motor together. The main drive system of the high speed CNC machine tool has canceled the belt drive and the gear drive. The main shaft of the machine tool is driven directly by the built-in motor, so that the length of the main drive chain of the machine tool is reduced to zero".
A mechanical spindle is a shaft that drives a work piece or tool to rotate on a machine tool. It is usually composed of spindle, bearing and transmission parts (gears or pulleys). In the machine, it is mainly used to support the transmission parts such as gears, pulleys, transfer motion and torsion, such as machine tool shaft; some used to clamp the work piece, such as core shaft.
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