Regarding productivity, the RZ 126 4.0 grinding machine sets industry standards in the high volume production of gears, and in its field, is the fastest machine on the market. Grinding speed (max.) 100 m/s The RZ 126 4.0 builds and expands on Reishauer?s successful twin-spindle machine concept. The machine combines the speed and productivity of the RZ 60 4.0 with the flexibility and the latest grinding technologies of the RZ 160 4.0 und RZ 260 4.0. Flexibility and Productivity The design principle embodies the uncompromising reduction of non-productive time by the twin-spindle technology, the short reaction time of the spindle drives and the high grinding speeds.