1) Graphite immersed in oil. Before machining graphite materials, they should be immersed in engine oil for dozens of hours to allow the oil to penetrate the graphite materials, so that the ash powder will not fly during machining and a smoother surface can be obtained.
2) Paint line. After the electrode is rough-processed on the outline surface, a thin layer of white paint is sprayed on the surface of the scribe line before scribe, so that the lines are clear and easy to machine.
3) Perform machining.