Abstract: A method of controlling a wire-cut electric discharge machine to improve machining accuracy in a machining operation for a corner portion of a workpiece to be machined. In a case where the portion to be machined includes a corner, a pressure and/or an amount of machining fluid supplied to a gap between the workpiece and a wire electrode is decreased only in a specified section. The setting of this specified section and adjustment of the machining fluid is carried out on the basis of an allowable discrepancy amount, and shape and size of the corner. Furthermore, in addition to decreasing electric discharge energy supplied between the workpiece and the wire electrode, the machining fluid may be adjusted within the specified region.

Abstract: A wire cutting electric discharge machine having a first and second group of expendable components, the first group of components being continuously used during machining including the upper and lower wire guides, the upper and lower wire feeders, the filter, and the ion exchange resin of the ion exchanger. The second group of expendable components includes a cutter for wire cutting, and the conveyor belts. At the end of a process involving cutting of the wire and wire extension, the cumulative frequency of use is compared to determine whether the life of the first group of components has terminated. At the end of machining, the CPU compares the working period of each of the second group of components obtained by adding the electric discharge machining time to the cumulative working period before the start of the machining, with an allowable working period read from a management table, to determine whether the life of each component in the second group has terminated.