Compacted graphite iron (CGI). which is used as a potential material in the auto industry. is a hard-to-machine material for the different minor elements and for the geometry of graphite with grey cast iron. The machinability of CGI in the drilling process was investigated with a 4-mm diameter fine-grain carbide twist drill under four lubrication conditions. https://foldlyers.shop/product-category/general-electronics-books/