| 摘要 |
A spindle assembly for a machine tool wherein a rear end portion of the spindle is structured to allow the spindle to be operated at higher speeds, thereby enhancing precision. The spindle assembly includes a spindle mounted within a spindle housing able to undergo rotation by a rotor and bearings. A collet directly secures and releases a tool inside the spindle. A draw bar, one end of which is connected to the collet through a sleeve within the spindle, operates the collet. A piston and cylinder connected to the draw bar moves the draw bar in forward and reverse directions. A rotary joint supplies cutting oil to the spindle. An adapting arrangement connects a rear end of the draw bar and the rotary joint to allow forward and reverse movement with respect to the spindle.
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