Disk chuck has been adopted in 74 series vertical shaft rotary die grinders , which can grind to the internal hole , excircle of large workpieces and workpieces with shoulders . die can work and grind to r - arc without removing guede - pole , and grinder head can rotate in the range from + 45o to - 45o . accordingly , the life of die is longer than before and accuracy of the die is stable 74系列立轴圆台模具磨床采用花盘式工作台，可对较大工件内孔、外圆和带有台肩的工件进行磨削，冲模模具可以不拆导向柱进行磨削及r弧磨削，提高模具使用寿命，保证模具使用精度，磨头可旋转45 。
