The main aim of this project is to obtain empirical modelling of wire electrical discharge machining (WEDM) by implementing a series of experimental tests for different cutting regimes and for different workpiece thicknesses. For this, we define an acquisition and dignosis system performed on an industrial WEDM. The aim of such a system is  to analyse a wide range of tests in order to detect a set of key variables that allow us to foresee the wire breakage and instability of the process.