EMERALD is a high speed milling machine characterized for its configuration fixed bed and mobile column. Projected with the aid of the modern methodologies of optimization through the calculation to ended elements, FEM, introduces a good point of meeting between rigidity in the movements and damping of the vibrations. If to this are added the low attritions and the elevated accelerations of the axes, are gotten so all the characteristics that allow particularly bright dynamic performances in finish, but at the same time make it too bright in roughing. The all to advantage of the economy of the whole cycle of machining.