GREEN AIR**.4 is a horizontal four axis working center machine which has additional C-axis rotation function and is equipped with a right-angle machining head on the basis of the horizontal three-axis working center. So that it can not only do the work of drilling，milling，grinding and polishing on the edge and internal graphics of regular and irregular glass sheet，it can also do the milling work on the edge of ultra-thick large glass sheet by using right-angle machining head connecting to the cup wheel. This processing speed is more than 3 times higher than using ordinary milling cutter.