SGM90D is the newly developed double feed tray grinding spring machine based on advanced CNC end grinding technology at home and broad. By the utilization of air cylinder, this device could achieve the circulating exchange of feed trays, grinding, loading or unloading, as well as feeding for grinding. It adopts servo motor to control the grinding wheel and has the functions of automatic inspection, compensation and alarming. The feed speed and quantity of the grinding wheel, grinding pressure, rotating speed of the feeding plate all can be programmed on the computer screen. It is convenient to operate and has a high efficiency and is ideal equipment for double-end grinding for large quantity.