30M Steel Frame Ruler,Steel Frame Ruler,Nserted Ground Steel Tape Measure,Frame Portable Ruler Zhongrui Tools Co., Ltd. , https://www.zhongruiglj.com Generally, the circular arc scribing method for larger castings: use a wooden strip with a thin copper skin as a stud, and draw the center and arc radius of the workpiece to be machined. Disadvantages: the wooden strip is easy to move, causing dimensional error when marking, and the wooden strip can only be used once, which is both labor and labor. To this end, we have created a scribing tool for the track plate parts of the GS50-8 automatic filling and capping machine. The manufacturing and use methods are as follows: