the structure is made of a base with a sliding upright in its rear section. both are in electrowelded steel duly stabilised after each work phase to ensure that there is no interior tension they are sized to guarantee st......the structure is made of a base with a sliding upright in its rear section. both are in electrowelded steel duly stabilised after each work phase to ensure that there is no interior tension they are sized to guarantee stability and precision during machining operations.