"Self-excited vibrations limit the productivity of aluminium and steel roughing. During aluminium roughing, chatter is related to tool modes (high frequency), whereas in the case of steel they are associated to the structure of the machine tool (low frequency). For aluminium, the dynamic characterisation of the machine is highly dependent on the tool and not on the machining position, whereas in steel roughing the dynamics are independent of the tool and depend on the position. Considering these differences the present research ..."