the f series, articulating five axes machiníng centres, are designed and built with rigidity, agility and flexibility in mind. f series specially feature an extra rigid construction with opposing slide ways on the z axis ......the f series, articulating five axes machiníng centres, are designed and built with rigidity, agility and flexibility in mind. f series specially feature an extra rigid construction with opposing slide ways on the z axis and the reinforced cross beam to ensure straightness and squareness precision is maintained even with its extra long y-v-axes.