An application from Germering in Bavaria shows that special machines are not required for milling high-polish plastic surfaces. The Enggruber company, in collaboration with Paul Horn GmbH, is crystal clear that this even works with conventional machines. The tools are monocrystalline diamond, which ensure surface quality to within nanometres during ultra-precision machining. "The quality of the tool cutting edge is the decisive factor for the surface finish that can be achieved," says HORN tool specialist and product manager for high-hardness cutting materials, Aribert Schroth.