There is the new chance to split the roughing in Z in more portions. The aim of this modification is to preserve the tool from breaking and overheating. It has been noticed that during the roughing of the first side, the tool tends to rapidly turn and go down in cavities, occasionally very small, as sometimes happens to the space between two connectors. In these cases the material (e.g.: Zirconium) which is not removed could "block" the tool, impeding the cooling and stressing it too much with the risk to break it, especially on high speed machines. To avoid this problem it is now possible to split the roughing of the same side in "phases" and to perform the roughing on the opposite side between these "phases". The aim is to make an hole in the disk and consent to get back on the previous side to go on with the machining avoiding a dangerous overstock of the material removed. To set the "phase" is necessary to input the code <PORTIONn/m>, in the name of the machining, where 'n' sets the number of the phase and 'm' sets the number of total phases. For instance: <PORTION1/2> or <PORTION2/2> Example of machining sequence: - roughing of the cavities side with <PORTION1/2> - roughing of the opposite side, without codes "<PORTION...>" - roughing of the part still to be machined of the cavities’ side, with <PORTION2/2> - other machinings Otherwise: - roughing of the first portion of the cavities side with <PORTION1/2> - eventual elimination of the stock interference with the axes of the cavity, to set free the access to the cavities with strong inclination - roughing of the cavities - finishing of the borders - finishing of the cavities - roughing of the opposite side, without codes "<PORTION...>" - roughing of the part still to be machined of the cavities’ side, with <PORTION2/2> - finishing of both sides Attention: This kind of managing is still a work in progress and could be refined and improved in the calculation times and in the length of the machining tool-paths. Your tests will be very useful for future improvement. The safety of the tool-path has been tested and did not show any variation in the behaviour.