Patent ID: 7652222

Claim:
A method for optimizing machining conditions of an electric discharge machine that a work to be machined is subjected to electric discharge machining by use of a machining liquid, the method comprising: detecting an average discharge voltage in a specified period of time at the time of electric discharge machining; determining a discharge current that makes a discharge voltage detected by the detecting equal to a discharge voltage when a new machining liquid is used, and the discharge current is determined based on relationships between a discharge voltage when the new machining liquid is used, a volume resistivity of the new machining liquid, and a discharge current of the new machining liquid; and determining discharging time, non-operating time, and a servo reference voltage, which depend on the discharge current determined by the determining the discharge current, from relationships between the discharge current, discharging time, non-operating time, and a servo reference voltage that establish optimum machining conditions.