Patent ID: 7019246

Claim:
A controller for a wire electric discharge machine performing electric discharge machining by applying electric discharge pulse current between a wire electrode and a workpiece while said wire electrode and said workpiece are caused to relatively move to each other, comprising: discharge pulse current integrated value computing means for computing to integrate discharge pulse current applied every predetermined time; moving means for relatively moving said wire electrode and said workpiece to each other along a machining path on the basis of a moving command; reference discharge pulse current integrated value memory means for storing a time integrated value for discharge pulse current which is used as a reference; means for determining a ratio of a numerical value obtained by said discharge pulse current integrated value computing means to a numerical value stored in said reference discharge pulse current integrated value memory means; and means for outputting, to said moving means, distance obtained by multiplying relative moving distance between said wire electrode and said workpiece to be determined by preset feed speed and said predetermined time by said ratio as a moving command every said predetermined time.