For special applications diamond turning and milling processes applying monocrystalline diamond tools may not be useful due to their geometric and kinematic limitations. Therefore, diamond contour boring has been developed for the manufactured of micro structured optical molds [A_1].

[A_1] Metal cutting in microstructures, E. Brinksmeier, O. Riemer, Multi-material Micro Manufacture, W. Menz & S. Dimov, 4M2005, pp. 19 - 25.