mod.500 general characteristics rack and pinion system ram drive the natural evolution of the technology had allowed to conceive these heavy duty slotting machines equipped with cnc on the 4 working axes. a very innovatio......mod.500 general characteristics rack and pinion system ram drive the natural evolution of the technology had allowed to conceive these heavy duty slotting machines equipped with cnc on the 4 working axes. a very innovation solution is the controlled z axis on the models cams 500e, 500ea and 500ea(850). cnc system on the 4th cutting axis is offering many considerable advantages, as follows: - drastic reduction of the setting time - significant inprovement of quality of the cutting motion. in fact the brushless motor drive is transmitting a continuous motion with constant torque from beginning to end stroke - the cutting motion is most regular in comparision with the conventional crank and connecting rod drive and this means a minor tool consumption. .