| 摘要 |
PURPOSE:To shorten a drill changing time by setting the diameter of the drill at the drill changing time and the moving speed of a spindle corresponding thereto inside a control device in advance concerning the perforator changing a drill based on the command sent from the control device. CONSTITUTION:The rotating speed of a motor 10 is set inside a control device 11. When the changing command of a drill 4 is transmitted from a work program, the rotating speed of the motor 10 corresponding to the diameter of the drill 4 held now is found. When the drill 4 is positioned on a tool post 3 by the movement of a table 1, the control device 11 operates the motor 10 at required speed, descending a spindle 6 via a feeding screw 9. After releasing the drill 4, the spindle 6 is ascended and when coming just above the drill 4 to be fitted next by the movement of the table 1, the motor 10 is rotated at the speed corresponding to the diameter of the drill thereof, the spindle 6 is descended and ascended after holding the drill 4. The drill changing time can thus be shortened without giving any damage to the drill. |
