The process parameters for wire cut electro discharge are optimised in this paper. The analysis takes into account the process parameters pulse on time, pulse off time, and current. High Carbon High Chromium (HCHCr-D2) steel is a high tensile strength alloy that is typically utilised in cold dies and tooling applications that demand a high level of and dimensional accuracy. For the machining procedure, a rectangular-shaped plate of the alloy steel HCHCr-D2 was used.