一、传动原理(如图) 小手轮1与大手轮2和长轴7通过螺纹联结在一起,7的球端靠弹簧9的推力压向碗形转轴17,二者靠滚动摩擦力带动17旋转。17的球端又带动主轴20移动。这时的带动摩擦力由弹簧9产生。转轴17所以作成碗形,是避免转轴的端面与长轴球端在中心点处接触。因为这时旋转力臂等于零。微调机构带动主轴微移必须具备的条件是:1.带动点要偏离旋转中心; First, the principle of transmission (Figure) Small hand wheel 1 and the hand wheel 2 and the long axis 7 through the thread together, 7 of the ball end by the force of the spring 9 pressed against the bowl-shaped shaft 17, both driven by rolling friction 17 rotation . 17 of the ball and then drive the spindle 20 moves. At this time the driving friction generated by the spring 9. Therefore, the bowl 17 is made of the shaft 17 to prevent the end surface of the shaft from contacting with the shaft end of the long shaft at the center point. Because the moment arm is equal to zero. Fine-tuning agencies to drive the main shaft must have the conditions of micro-conditions are: 1. Driven point to deviate from the center of rotation;