Two WC67Y/WC67K/ZYB series in same specification or different specification(only for ZYB series)are choosen as main machine with double motor linckage synchro-device,
which may work together to process overlong workpiece or operate separately to increase production efficiency. Deflection compensationdevice is fitted too. Mechanic and fluid
servos with mechanic slider are utlized in synchronous device. The stroke of upper beam and the position of rear stopper are regulated quickly by machine and micro-regulated
by hand with electronic display o CNC controllers.