Accuracy of machine tools

The largest share of thermally-related inaccuracy on machine tools is produced in most cases in the feed drives. High speeds and acceleration levels heat up the ball screws and cause them to expand. Without suitable position measuring technology, this can lead to positioning errors of up to 100 µm within a few minutes. However, workpieces with tight tolerances can only be produced on machine tools that remain thermally stable despite very different machining operations.