| 摘要 |
PURPOSE:To easily process a hole through which a machine screw is allowed to pass and a countersunk head in only one process by coaxially attaching a drill and a spot facing cutting tool to a chuck. CONSTITUTION:A body 1 is fixed on a chuck (not illustrated) holding a drill (not illustrated) by means of a fixing machine screw 2. A hole 13 through which the drill is allowed to pass and a groove 14 for positioning a spot facing cutting tool 6 are drilled in a holder 3 in integrated configuration. The drill and the cutting tool are allowed to pass through a through groove 20, and the holder 3 is fixed by means of a screw 5. One piece of the spot facing cutting tool 6 is adjustably fixed into the groove 14 by means of a machine screw 7. The hole through which the machine screw is allowed to pass is processed by means of the drill, while countersink processing is simultaneously performed by means of the cutting tool 6. |
