The so-called mosaic CBN tool has a complete top surface, sintered on a carbide substrate, only on the side of the tool to provide multi-cutting edge, this tool is cheaper than the composite tool, can be made into a multi-edge , To a large extent reduce the processing costs, but mainly for finishing processes, single-edged knife depth control within 0.3mm as well, can achieve high-speed turning ,, finish up to Ra0.8-0.4.