| 摘要 |
PROBLEM TO BE SOLVED: To provide a drill head which is suitable especially for high number of revolutions and which can be miniaturized. SOLUTION: A drill head is provided with a finely adjusting mechanism 3 for a tool carrier 4 and a balance weight 7 accommodated in a tool main body 2. In order to avoid the deviation, when a cutting tool 5 is adjusted, the balance weight 7 is spontaneously adjusted in the direction reverse to that of the adjustment via a transmission device 6. The carrier 4, the balance weight 7, and a posi-tioing screw 11 of the finely adjusting mechanism 2 can be fastened and fixed at the same time by using a fastening means 8. |
