What is the difference between single vertical milling and double vertical milling of woodworking machinery?

Simply put, single vertical milling is only used for milling straight lines, and double vertical milling is used for milling circular arcs. The operation mode is to start milling from the top to the lowest point. If your material is concave, you can grind the right general with the right knife and the left half with the left knife to prevent choking flying wood. If your material is convex, the right knife will grind the left half and the left knife will grind the right half. The principle is the same as above The last two cutterheads rotate relatively, and in addition, single vertical milling can also complete the work of double vertical milling.