These 3 types of machines are all used for make welding groove on edges of sheet metal plate. In other words, make beveling. Of which, End Milling Machine has the largest applicating volume, because it has wide range of applicable size for workpieces, and high precision, high production efficiency; The Hobbing Cutter Shearing Machine focuses on small size workpiece; And CNC Flame Cutting Machine has the bottom running cost, but produces relative rougher cutting kerf, which need to be trimmed;