| 摘要 |
PURPOSE:To receive and transmit the electric current for control or detection or the electric power for drive in high accuracy between an electrical means and a fixed side by incorporating a sensor and an actuator into a spindle or a tool holder and allowing silver, etc. to be interposed between the electrical means and the fixed side. CONSTITUTION:When a spindle 2 advances in X direction, and a sensor 7a corresponds to a magnet 21, a detection signal is generated and sent into a control observing apparatus 18, and an NC apparatus stops advance. Then, conductive liquid 14 permits the electrical connection between terminals 12 and 13, and the detection signal is allowed to pass, and the positioning in the X direction is carried-out. Then, the spindle 2 is transferred in Y and Z directions and positioned at the working position for a work 19. Then, the apparatus is correctly advanced by the shift amount corresponding to the working depth by the working feed in the X direction. Since the sensor 7a is installed onto a tool holder 5, the accuracy in the working depth is not directly influenced, even if thermal displacement is generated onto the spindle 2, fixed part 3, etc. |
