One arbitrary point on an upper surface of a workpiece and two points at arbitrary heights on a tapered section of the workpiece are measured using a contact detector disposed on an upper wire guide of a wire electric discharge machine to calculate the shape accuracy and tapered angle. Based on the calculated data, the upper and lower wire guide support positions of the upper and lower wire guides are calculated. Using the calculated upper and lower wire guide support positions, electric discharge machining is performed on the workpiece.

Provided are a wire electric discharge machine, a correction device, and a correction method which accurately correct position information indicating the position of a supporting point of each of an upper guide and a lower guide. The correction device includes: a storage unit that stores the position information; an inclination control unit that causes a wire electrode to incline at a predetermined angle; a measurement unit that measures a relative movement amount from a state in which the lower guide and a measurement site are separated by a predetermined distance in a relative movement direction to a state in which the wire electrode inclined at the predetermined angle reaches the measurement site; and an information correction unit that corrects the position information of the storage unit on the basis of the predetermined angle and the relative movement amount.

An electrical discharge machining (EDM) fixture for machining a part includes a support structure fixable onto a work surface, a base plate fixed to the support structure, a toggle clamp positioned on one side of the base plate, and a secondary clamp positioned on an opposite side of the base plate. A plurality of contact points are respectively associated with the toggle clamp and the secondary clamp, and a tool ball is fixed to the base plate.

The present wire electrical discharge machining device for machining a workpiece includes an electrical discharge machining wire spanning between and supported by a first guide assembly and a second guide assembly. The first guide assembly, which includes a first electrode guide and a first nozzle, is located on an upper head and the second guide assembly located on a lower head of the wire electrical discharge machining device. A tool holding system removably mounts the first guide assembly to the upper head, the tool holding system being operable in either an engaged configuration or a released configuration. In the engaged configuration, the first guide assembly is retained in an operating position. In the released configuration, the first guide assembly is detachable from the upper head of the wire electrical discharge machining device for interchange with a replacement component.