AbstractGrinding soybean meal and hulls may be considered an art—rather than a pure science—because of the need to blend properly all of the parameters involved to produce the desired finished product. Grinding soymeal for a protein supplement to animal feed is best achieved by using a side‐fed mill, with plenty of air throughput and a large screen area. However, for the fine grinding of soymeal or isolate products (50‐mesh or finer), an impact turbo mill with closely controlled clearances is generally used. Soybean hull grinding requires a mill with a high hammer‐tip speed, wear‐resistant grinding elements, good air flow, and again, large screen area. The size and speed (rpm) of each mill in a system is usually a function of the location of the mill in the system, and the type of system selected to deliver the desired finished product.