T 68 镗床工作台四等分定位时,因活动定位垫块与圆头定位螺丝容易产生撞击,影响定位精度。我们将其改用百分表定位后,其优点是:加工方便,使用寿命长,重复定位精度高,且比较直观。 如图所示,该定位装置通过支架1安装在上滑板9左侧,与钢珠2接触的轴4及顶丝5的端面上均加工有顶尖 T 68 boring machine table four points positioning, the positioning of the positioning pad and the round head of the screw is easy to impact, affecting the positioning accuracy. We use it to switch dial indicator, its advantages are: easy processing, long life, repeat positioning accuracy, and more intuitive. As shown in the figure, the positioning device is mounted on the left side of the upper sliding plate 9 through the bracket 1, and the top end is machined on the end faces of the shaft 4 and the top wire 5 which are in contact with the steel ball 2