Working principle: Rectangular dense pole electromagnetic chuck refers to the pole distance of 1+4 and below, suitable for clamping small and thin workpieces with surface grinding machines. The suction force is generally 130-150N/cm2. Can be used for surface grinding machine, tool grinding machine, EDM machine to absorb all kinds of magnetic permeability workpiece for processing, uniform suction, high processing precision, suitable for processing thin small workpiece.