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In order to machine a wide variety of materials with a single spindle and setup, a multi-purpose spindle for machine tools has been developed. The spindle achieves both high power/ torque for heavy duty milling operations and higher rotational speed. The developed spindle is equipped with an additional motor at the back of a conventional induction motor driven spindle to assist the induction motor when high milling torque is needed. For high speed operation, the additional motor can be mechanically disengaged and the spindle can be used as a conventional spindle. A Permanent Magnet Synchronous Motor (PMSM) is adopted for the additional motor, because a highly stable milling operation can be realized by utilizing the advantage of the PMSM. As expected, cutting experiments have shown that the material removal rate has been greatly improved with the developed spindle.