i and i³-technology:
Independent spindles

Twin-spindle machining concepts have been used for many years as an alternative to the usual single-spindle machining centers. For many years, however, the fields of application of twin-spindle concepts were limited by the machine architecture. Both spindles were rigidly fitted to each other in the machine. Thermal influences, but also limits in the accuracy of the mechanical coordination of the spindles to each other and to the clamping nests limited the achievable machining accuracies on the work pieces.


The use of modern development methods makes it possible that all LiFLEX twin-spindle machines are now equipped with Z-direction independent correction options (i-technology). It was important to ensure that not one spindle is moved relative to the other, but that both lockers act independently of one another and of equal value with regard to their rigidity in the machine group.


With the “i-technology” supplied with heavy-duty machining tasks in the LiFLEX standard, different tool lengths in the NC program can be easily compensated.


For larger axis distances and the influence of different temperatures in the factory and the optionally used coolant on the machine structure fluctuations remain particularly in the X direction, but also in the Y direction in the quality of machining.


For highest demands on the work piece quality our “i³-option” is used. Both spindles can be corrected independently in all three directions (X, Y and Z). The Lava-i³ compensation system, based on the detection of thermal changes in the machine architecture, combined with a sophisticated algorithm ensures that work piece quality remains as constant as possible, already 5 minutes after the start of the “cold machine”.


Our i³ functionality significantly reduces the “emotional obstacles of twin-spindle” for less experienced users, even when it comes to the highest work piece quality.