A machine tool in which the workpiece is transported by a pair of longitudinal carriages with transverse and vertical carriages supporting the workpiece holders to a machining region from a workpiece replacement region. The tray is formed by a zipper with two tear lines that are formed in the adjoining bottom flaps of the carton. 5 to 2 N15 mm, preferably 1 to 1. An output of a pulsed power supply is electrically connected between the anode and the cathode assembly. Attachment of the one leg of piezoelectric element to the flexure produces translation movement of the slider and head transducer while attachment of the center leg of the element to the flexure and the two ends legs to the slider produces a rotary movement of the head transducer.