there is no air between the punch, the material being formed, and the die.While press brake technology has progressed over the years, the basic press brake process terms haven't... could repeat to only 0.004 in. or more, too inaccurate for precision bending.Think of the mechanical press brake's motion as it relates to a boxer's arm throwing a punch. If the arm..., to the screw, to the ram, to the punch, to the material, to the die as rigid as a boxer's arm extended.Mechanical presses required tremendous skill. With no hydraulics or CNC to assist...