| 摘要 |
PURPOSE:To prevent a grinding solution from rising and reversely flowing through a hollow part and being splased on a high frequency motor to cause leak of a current and to prevent flying of a grinding solution to the outside, by a method wherein a taper where the machining tool mounting side is increased in size is formed on the hollow part of a spindle shaft. CONSTITUTION:A spindle shaft 10 is rotated at a high speed by means of a high frequency motor 16 to apply a grinding work on a workpiece by means of a grinding stone 11 attached to the shaft 10. In this case, a grinding solution fed through a pipe 12 to the workpiece is brought into a misty state, and is intended to rise through a hollow part 13 of the spindle shaft 10 or to reversely flow by means of a centrifugal force generated occasion by high speed rotation of the spindle shaft 10. However, since the centrifugal force is exerted on the grinding stone 11 side of the taper 14 surface of the hollow part 13, the reverse flow of 8 grinding solution is prevented from occurring. Further, by the feed of compressed air to the hollow part of the spindle shaft 10 through an air hole 22, grinding mist can be prevented from rising through the hollow part 13.
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