Lay out plate, sheet steel or other heavy metal and mark bending and cutting lines on work piece using protractors, compasses and drawing instruments or templates.
铺设莱板，钢板或其他重金属，用量角器，圆规和绘图工具或模板在工件上标记弯曲和切割线。
2
The utility model is characterized in that an elliptic auxiliary part for drawing ellipses is connected to the compasses on the basis of the original compasses.
其特点是在原有圆规上又连接有一个画椭圆的椭圆辅件。
3
It can not only be used in drawing graphics like compasses and rulers, but also can reach dynamic effect which compasses and rulers can't do.