I'm an amateur machinist trying to look after my dad's machine shop for a while. We have a Cincinnatti Milacron Arrow 750 mill that continually gives us problems. This morning, I was unable to run it because I kept getting "Z Axis Drive Fault"s. At first, I could work around them because they were infrequent and only between cycles. Now they happen every minute and even when the machine is mid-cycle. Does anyone know if this is more likely an electrical problem (servo board?) or a mechanical problem (z axis column stuff)? Any help appreciated.