Abstract: A method of determining machining condition for a sinker electric discharge machining apparatus in which a tool electrode is advanced along a z-axis to machine the workpiece, comprises the steps of: (a) producing a cavity model (D) as a solid model of part of the tool electrode; (b) tessellating the cavity model into a mesh of triangle each of triangles having an ordered set of vertices and having an orientation defined by the ordering of the vertices; (c) projecting the triangles on an xy plane surface; (d) summing up areas (S) of the projected triangles having the same orientation to calculate a machining area; and (e) determining machining conditions based on the machining area.

Abstract: An NC data creation device for creating NC data for forming at least one shape by electric discharge machining using at least two blades formed on one or more tool electrodes. Blade registration means registers the at least two blades (Q). Step registration means registers at least two steps to form the at least one shape (P). Blade assignment means assigns the at least two blades to the at least two steps. NC data creation means creates NC data including the at least two steps. The NC data creation means may create position commands for causing movement of the tool electrodes between two consecutive steps.

Abstract: A method of determining machining condition for a sinker electric discharge machining apparatus in which a tool electrode is advanced along a z-axis to machine the workpiece, comprises the steps of: (a) producing a cavity model (D) as a solid model of part of the tool electrode; (b) tessellating the cavity model into a mesh of triangle each of triangles having an ordered set of vertices and having an orientation defined by the ordering of the vertices; (c) projecting the triangles on an xy plane surface; (d) summing up areas (S) of the projected triangles having the same orientation to calculate a machining area; and (e) determining machining conditions based on the machining area.