This paper introduces an optimization study when electrical discharge machining (EDM) cylindrical parts made of 90CrSi tool steel. The objective of this optimization study is to achieve the maximum material removal speed (MRS). This is an experimental study with the use of the Taguchi method in Minitab 19 software to design the experiment and analyze its results. The impact of the input process parameters, including the pulse on time, the pulse off time, the servo current, and the servo voltage on the MRS was evaluated. In addition, optimal EDM parameters for the maximum MRS were found.