Abstract: In an electrical discharge machine that applies a voltage between an electrode and a workpiece to generate electrical discharge, an electrode holder holds the electrode. An ultrasonic motor has a fingertip that comes into contact with electrode holder, and moves electrode holder in a driving direction by moving the fingertip in an annular manner at an ultrasonic-range frequency. A roller bearing guides the movement of the electrode holder in the driving direction. A control circuit controls a position of the electrode in the driving direction by driving the ultrasonic motor, and moves the electrode holder based on an abnormality occurring in resistance against the movement of the electrode holder in the driving direction such that the electrode holder is moved by a movement distance equivalent to when the largest roller element among a plurality of roller elements of the roller bearing rolls and rotates once without sliding or longer.

Abstract: In an electrical discharge machine that applies a voltage between an electrode and a workpiece to generate electrical discharge, an electrode holder holds the electrode. An ultrasonic motor has a fingertip that comes into contact with electrode holder, and moves electrode holder in a driving direction by moving the fingertip in an annular manner at an ultrasonic-range frequency. A roller bearing guides the movement of the electrode holder in the driving direction. A control circuit controls a position of the electrode in the driving direction by driving the ultrasonic motor, and moves the electrode holder based on an abnormality occurring in resistance against the movement of the electrode holder in the driving direction such that the electrode holder is moved by a movement distance equivalent to when the largest roller element among a plurality of roller elements of the roller bearing rolls and rotates once without sliding or longer.

Abstract: When forming a micromachined part by water jet guided laser machining at a machine component 20, a point for forming a micromachined part is machined while moving a laser head 7 side and machine component 20 side so as to obtain a desired shape of a micromachined part.

Abstract: A laser machining device machines a workpiece having a machining portion where a hole is machined and a non-machining portion positioned on an extension of the hole. The laser machining device includes a nozzle that jets a column of liquid towards the hole of the machining portion and a laser head that introduces a laser beam into the column of liquid jetted towards the hole. The workpiece is held by a holding member. A laser beam blocking member is disposed in the non-machining portion. The laser beam blocking member blocks the laser beam that passes through the hole. Furthermore, a discharge path that discharges the liquid reaching the hole is provided in the laser beam blocking member.

Abstract: When forming a micromachined part by water jet guided laser machining at a machine component 20, a point for forming a micromachined part is machined while moving a laser head 7 side and machine component 20 side so as to obtain a desired shape of a micromachined part.