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带中心钻活动顶尖经使用,效果良好。使用时只需将托架7放在水平的位置,如图所示,即可进行打中心孔。打完中心孔后,将托架7向前拉并转到垂直位置,就可移动活顶尖顶住刚才钻成的中心孔,继续加工零件,操作很方便。为适应小批单件生产的特点,采用2～13毫米的三爪钻夹头,这样可以装夹不同尺寸的中心钻,并可装夹一般钻头进行钻孔。如成批生产建议仍采用衬套的结构形式。因三爪钻夹头较衬套轴向尺寸长些,即伸出车床的尾座的尺寸也相应长些,故刚性不够好。中心钻头与活顶尖的不同心度,主要由锥杆2来保
With the center drilling activities used by the top, the effect is good. Just use the bracket 7 on the horizontal position, as shown, you can play the center hole. After playing the center hole, the bracket 7 will be pulled forward and turn to the vertical position, you can move the living roof to withstand just drilling into the center hole, continue to process the parts, the operation is very convenient. In order to adapt to the characteristics of small batch production, using 2 ~ 13 mm three-jaw drill chuck, which can be installed in different sizes of the central drill, and the general drill bit can be installed for drilling. Such as mass production is still recommended to use the structure of the bushing. Due to the three-jaw drill chuck longer than the axial length of the sleeve that extends the lathe tailstock size is also longer, so the rigidity is not good enough. Core drill bit and live center of the different heart, mainly by the cone 2 to protect