| 摘要 |
PROBLEM TO BE SOLVED: To provide a tool detachably mounted on a spindle of a machine tool, adaptable to be driven without being connected to an external power source, less in thermal expansion and automatically exchangeable. SOLUTION: The tool comprises a cutting edge 100 for machining a work, a motor 80 for driving the cutting edge 100, a generator 70 for generating electric power to drive the motor 80, a mounting part 62 having at a central portion a flow path 120 for passing a cooling medium 101 to cool the tool and a flow path 121 ranging from the way of the flow path 120 to the flow path 120 opening to the side of the outer diameter portion near the generator 70 for transmitting rotating force from the spindle 46 to the generator 70, the mounting part 62 being mounted on the spindle 46, and a flow path 123 ranging to the flow path 121, provided between a space on the side of the generator 70 and a space on the side of the motor 80 for passing the cooling medium 101.
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