要正确地对中空件等进行圆孔或圆弧划线是比较困难的。这里介绍的划针盘工具,可方便解决上述难题。如图1所示,在与座1相固定的杆2上装一转臂3。转臂上装有划线头4,松开螺钉5就可以在转臂上移动划线头,以调节半径大小,调整好半径后绕杆2转动转臂即可在工件6上划出圆弧。如零件较多,可装上定位装置。如果再加装划线头4和5(见图2),就可以 It is difficult to correctly mark the hollow parts such as circular holes or arcs. Introduced here dial tool, can easily solve the above problems. As shown in FIG. 1, a boom 3 is mounted on a pole 2 fixed to the base 1. The arm is equipped with a scribe head 4, loosen the screw 5 can move the scribe head on the boom to adjust the radius, after adjusting the radius, turn the arm around the rod 2 to draw an arc on the workpiece 6. If parts are more, can be installed on the positioning device. If you add scribing heads 4 and 5 (see Figure 2), you can