It is generally believed that CBN grinding wheels are not suitable for grinding soft materials such as mild steel, because the grinding debris generated at this time easily blocks the grinding wheel. However, the current research believes that the ceramic bond CBN grinding wheel can take the increase of the grinding wheel line speed to form fine grinding debris, and then use high-pressure jet grinding fluid to remove the grinding debris, and supply sufficient grinding fluid to prevent the grinding wheel from clogging. Therefore, the CBN grinding wheel is a kind of soft material that can grind low carbon steel (hardness greater than 30HRC). However, CBN grinding wheels are not effective in grinding any material. Usually it is not suitable for grinding cemented carbide and the combination of cemented carbide and steel, in which case the diamond wheel has a better effect.