Object printed circuit board (PCB) is a PCB substrate machined copper clad laminates. Copper Clad Laminate is the use of adhesives and insulation materials made ​​of copper by hot pressing.

PCB copper clad laminates reinforced base materials are mainly two: one is a glass fiber cloth, another is paper-based. Currently used in printed circuit PCB industry is the largest epoxy glass fiber cloth boards.

Whether paper or glass fiber cloth sheet substrate, the mechanical processing performance than the poor. As can be seen from their structures, they are brittle and visible stratification, and a high hardness, the wear and machining tool is not in the fully cured resin sheet containing mechanical friction heat generated in the process will soften the resin viscosity was not completely cured, increasing friction, broken tools, while generating and greasy dirt, affecting processing quality. In order to improve processing quality, we need a carbide cutting tools, a large amount of feed machining process can guarantee the quality.