自行车前叉立管下端需车外圆φ2_(0.050)~(0.095)mm(图1),在普通车床上用三爪卡盘进行加工,效果差。为此,我厂在普通车床上安装了不停车夹头(图2),使用效果较好。开动机床后,前叉立管插入弹性夹头8的孔内定位,逆向转动手柄1,使外壳3沿螺纹旋紧。轴承4带动主套6,一起向旋紧方向移动至夹紧前叉立管为止。由于底盘2、底座12安装在原机床床头箱体上,套简7与机床主轴相配(莫氏5号),故机床主轴带工件转动,其外壳不转 The lower end of the bicycle front fork riser need to car outside φ2_ (0.050) ~ (0.095) mm (Figure 1), in the ordinary lathe with a three-jaw chuck for processing, the effect is poor. To this end, I plant installed in the ordinary lathe does not stop chuck (Figure 2), the use of better. After the machine tool is started, the front fork riser is inserted into the hole of the elastic collet 8 to be positioned, and the handle 1 is rotated in the reverse direction to tighten the shell 3 along the thread. The bearing 4 drives the main sleeve 6 to move in the tightening direction until the fork tube is clamped. As the chassis 2, the base 12 is mounted on the original machine bed head box, sleeve Jane 7 match with the spindle (Morse 5), so the machine spindle with the workpiece rotation, the shell does not turn