© 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.In manufacturing industry, a material has more than 60 HRC hardness value; conventional methods are not effective as much as non-traditional methods. Therefore, it is required to use alternative methods like electric discharge machining (EDM) which has a high hardness and complex geometry advantages. In this experiment, a EDM method is presented for different electrode grades. Graphite has the much better machining performance for EDM than other electrode materials. EDM is a non-conventional process that mainly used for hard and complex shaped metals which have electrical conductivity. EDM effects on material removal rate (MRR), peak surface roughness (Rz), and electrode wear rate (EWR) were experimentally calculated. Selected parameters were graphite type (HK3, HK15, HK75), current (2, 3, 4), pulse on time (25, 30, 35), and pule of time (15, 20, 25). Differences in the MRR result in the change in the Rz higher values of parameters increased Rz, MRR, and Rz values. In this experiment, Taguchi L9 orthogonal experimental design method has been used on WP7V hybrid tool steel.