生产大型产品的工厂里,往往会遇到直径在5公尺以上的工件,要对这些工件进行划线是比较困难的。这里向大家推荐一种如附图所示的划规,结构简单,同时精确度也比较高。划规长约4～6公尺,可以划直径8～12公尺的大工件。图中1是一个1～2吋的无缝钢管。2是铁堵,堵住钢管1的两端,以避免钢管变 Factories that produce large-scale products often encounter workpieces that are more than 5 meters in diameter, and marking these workpieces is more difficult. Here to recommend a plan as shown in the drawings, the structure is simple, while the accuracy is relatively high. Planned length of about 4 to 6 meters, you can draw a large diameter of 8 to 12 meters of the workpiece. Figure 1 is a 1 to 2 inches of seamless steel pipe. 2 is the iron block, plug the ends of a steel pipe to avoid pipe changes