Constant hydrostarter face driver is mainly used on the forming lathe, CNC lathe and common lathe to process axis type workpiece. Put in only one collet, you can get all dimensions of the workpiece's exterior. Use the workpiece's centre hole to locate. We can guarantee the quality. Driving plate propelled by three floating hydraulic cylinder to stab to the end of workpiece and made the work piece rotate. When the end face and the axis in not perpendicular within 5 degree, constant face driver can work regularly. Constant face drivers used to be provided with driving center's body together with changing centre and driver, please mention specification on the individual order. Also we can manufacture changing able center and driver plate.