2. U-V table as per the NC program in

2. Wire Electric Discharge Machining (WEDM) has been one of the most significant innovations affecting the tooling and machining industry. These machines are employed to machine alloys having high hardness, toughness and impact strength. The ultimate requirement of any machining process being fine surface finish is accurately satisfied by wire-cut EDM process.In this project, MAXICUT wire-cut electrical discharge machine was utilised for the machining process. It uses a thin single-strand brass wire, which is held in tension and passed through the workpiece, which is submerged in a tank of dielectric fluid, usually deionised water. The wire is held between upper and lower diamond guides. The workpiece is mounted on the main work table (also called X-Y table) whereas a parallel auxiliary table (also called U-V table) supports the upper diamond guide while the lower guide is stationary. The simultaneous control of the X-Y table and U-V table as per the NC program in the controller allows the machine to cut very intricate and delicate shapes.The process parameters affecting the machining conditions are:• Coolant pressure• Pulse on time• Pulse off time• Wire tension• Wire feed rate• Gap voltage• Average Gap current3. The primary objective of the project was to obtain the best surface finish by optimising various process parameters affecting the machining conditions in EN 8 steel and High speed steel. With the assistance of Taguchi quality engineering, 18 experiments were conducted by varying the process parameters at various levels. The output response variable being surface roughness was measured for all the experiments performed. As the lowest value of surface roughness indicates the best surface finish, the optimum parameter level combination was analysed which gives the desired surface finish. These optimised values of various parameters were then used in performing the final machining operation to obtain the desired output.