When the upper surface of the workpiece is detected, a plate thickness calculation section calculates {HEAD ~ a plate thickness} of the workpiece based on {TAIL ~ an upper surface position} of a die, that is known in advance and stored in a memory 
based on
When the upper surface of the workpiece is detected , a plate thickness calculation section calculates { HEAD ~ a plate thickness } of the workpiece based on { TAIL ~ an upper surface position } of a die , that is known in advance and stored in a memory
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH