GMB series machines are equipped with ZF gear-box of two-steps made in Germany and spindle units of high rigidity to meet requirements of rough machining with large torque in low speed, as well as precision machining with high speed. The design of cross beam in large section area and guide-ways of step construction have been combined perfectly to increase stability during cutting. The machines can be equipped with different accessories such as high rigidity milling head to realize five-side machining.