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在圆孔或圆弧的划线工作中,如果中心是空的,就必须用木块等填实中心;并在圆心处钉上铁皮,然后找中心划圆,所以手续非常麻烦。如碰到在侧壁上的圆弧部分,就更费事。这种例子在加工铝型板中很多,不容易划得正确。为了划线便利起见,这里有一种较实用的办法,即利用划针盘来代替圆规,这样圆孔的中心可以不填任何东西。如图1所示,在杆2上装-旋转臂3,它可上下运动,又可绕绕杆2转动。划针4固定在旋转臀3上,也可
In the marking of round holes or circular arcs, if the center is empty, it is necessary to fill the center with wooden blocks or the like; and the center of the circle is stamped with metal, then the center is rounded, so the procedure is very troublesome. If you encounter the arcuate part of the side wall, even more trouble. This example in the processing of aluminum many, not easy to draw the right. For the sake of scribing convenience, here is a more practical way, that is, using the dial instead of compasses, so that the center of the hole can be filled with nothing. As shown in FIG. 1, the lever 2 is provided with a swivel arm 3 which can be moved up and down and also around the lever 2. Scribe 4 is fixed on the rotating hip 3, but also