在钻床上机动攻丝,当工件被夹紧时,常常会发生待加工螺纹孔与钻床主轴不同心。在攻丝时,造成丝锥折断。为此,我厂制造了一只用来攻丝的专用夹具,它能自动调节待加工孔的中心位置,使孔的中心对准钻床主轴中心。夹具的结构如下:在底座5和工作台2上分别开有三条圆弧长槽,件5的槽是纵向的,而件2上的槽则是横向的,在中间滑台4的上下两面开有相互垂直的六条圆弧长槽。分别与件5和件2上的槽相对应。在槽中嵌入数个滚珠3后,工作台2就能相对底座5作前后左右四个方 In the mobile drilling machine, when the workpiece is clamped, often occur to be processed threaded hole and drilling spindle is not the same heart. When tapping, causing the tap to break. To this end, I plant a special fixture for tapping, it can automatically adjust the center of the hole to be machined, so that the hole center aligned drill spindle center. The structure of the fixture is as follows: There are three arc-shaped long grooves on the base 5 and the worktable 2 respectively. The grooves of the member 5 are longitudinal and the grooves on the member 2 are transverse. On the upper and lower surfaces of the middle slide 4, There are six vertical arc slot. Correspond to the grooves on the pieces 5 and 2, respectively. Embedding a few balls in the groove 3, the table 2 can be relative to the base 5 for about four sides