In the production of chemical equipment, the flange diameter of the connecting cylinder is mostly more than 1m, and there are dozens of flange connecting holes. To use the old method to draw the flange hole line, it is very troublesome to use the horn and the large rule to find the center of the circle, and then draw the hole size line, and it is not easy to mark. To this end, I made a trajectory (as shown). According to the law
Commercial Lighting,Led Troffers,Flat Panels,Vapor Tight Strips
Fuonce-led , https://www.fuonce.com