During machining occurring losses conduct into the machine tool and lead to deformations that impair the machining accuracy. Thus, high effort is invested into the compensation of thermo-elastic errors. One new approach is to use the information extractable from part programs in combination with CNC controller systems to forecast occurring losses in terms of a look ahead function. The method allows the evaluation of part programs with respect to its thermal influence on the machine tool. Therefore, the method is applied on selected part programs, resulting loss distributions are discussed in terms of their thermal impact, and potential follow-up strategies are stated.