A determination section detects a position at which {HEAD ~ a punch} attached to {TAIL ~ the ram} contacts an upper surface of a workpiece, based upon a change in the detected pressure 
A determination section detects a position at which { HEAD ~ a punch } attached to { TAIL ~ the ram } contacts an upper surface of a workpiece , based upon a change in the detected pressure
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH