Magnetic Grinder is the use of the magical magnetic field jumping force conduction to the stainless steel needle, grinding needles, grinding material; produce entrainment workpiece high-frequency rotary flow, vibration, commutation tumbling, scratching the surface of the workpiece, the early workpiece holes, internal and external teeth and surfaces, concave and convex surface friction, to achieve the cleaning, de-greasing impurities, deburring, grinding, and other precision polishing effect.