... MachineTechnical parameters:1.Power Supply:AC220V2.power:Ultrasonic:50W,Spark:250W(Level:Coarse ,Middle,Fine)3.Frequency:20-30KHZ ... mould, casting mould, forged mould.Specialty:The K988C ultrasonic electric spark mould glazing machine has high-performance, long life span, ... work piece surface, and it compounds electric sparking function which can carry out electric spark for the coarse surface Ra>50um ...