在一般的盲孔或台阶孔内开沟槽,可以使用图示工具在钻床上完成。工具由空心套与心轴两零件组成,其结构形式一目了然。套是用工具钢制成。心轴可在套内滑动。使用时,将夹持在钻夹头的工具伸入工件孔内,当心轴端部抵至台阶或孔底后,继续向下进给,刀刃被心轴的锥面强迫张开,并在孔 Grooving grooves in the usual blind or stepped holes can be done on the drilling machine using the illustrated tool. Tools by the hollow sleeve and the spindle two parts, its structure at a glance. Set is made of tool steel. The spindle can slide in the sleeve. When in use, the tool clamped in the drill chuck extends into the workpiece hole, and when the end of the spindle reaches the step or the hole bottom, the tool continues to feed downward, the blade is forcibly opened by the conical surface of the mandrel,