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钻中心孔工具套如图所示,工具套内锥面与顶尖60°外锥面吻合,孔径与顶尖前部为滑动配合。中心钻外圆表面磨一小平面,保证夹紧可靠。使用时,工具套圆周上的圆形槽与在顶尖前部台阶上配钻的φ4mm圆柱销快速连接,定位锁紧。将装有中心钻的工具套装在尾架顶尖前部,使顶尖上的圆柱销对准工具套的缺口,随之逆时针旋转一个角度,使圆柱销贴紧在工具套圆形槽底内,即可钻削中心孔。钻完后,只要将工具套顺时针旋转至缺口处卸下,摇动尾座手轮,使顶尖顶在已打好的中心孔内,便可开始车削。使用中对不同直径的中心钻,可通过调换不同内径的衬套来实现。
Drill center hole tool kit As shown in the figure, the inner conical surface of the tool kit matches with the outer conical surface of the top 60 °, and the aperture is matched with the front of the top. Center drill a small surface of cylindrical grinding to ensure reliable clamping. When in use, the circular groove on the circumference of the tool sleeve is connected with the φ4mm cylindrical pin with a drill on the top front step to be locked tightly. Set the tool with the center drill to the front of the tip of the tailstock so that the pin on the tip aligns with the notch of the tool sleeve and then rotate it counterclockwise by an angle so that the pin fits tightly into the bottom of the circular groove of the toolbox, You can drill the center hole. After drilling, as long as the tool kit clockwise rotation to the notch at the unloading, shaking the tailstock hand wheel, the top of the top in the center hole has been laid, you can start turning. The use of centering drills of different diameters can be achieved by changing bushings of different inner diameters.