Sensitivity A control switch that adjusts the response time of the servo mechanism. The device that drives and controls the movement of the quill or ram. The time between a signal to the servo and its physical response to the signal. In EDM, the wear along the side walls of the electrode. Silicone A dielectric fluid for special situations consisting mostly of the chemical polymer silicone.
Silver tungsten A porous tungsten material which is infiltrated with silver.
Slurry A watery mixture of insoluble material and water. Used as an abrasive in ultrasonic machining. Solid state power supply Transistorized circuitry. The forming tool in ultrasonic machining. Spark An electrical discharge of very short duration between two conductors.