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Animal feed is the most significant component of production cost in livestock cultivation, and its quality determines livestock productivity. Corn cobs are one alternative feed source containing high fiber and are relatively inexpensive. To utilize corn cobs as animal feed, they must be crushed into small particles to increase digestibility. This research aimed to design, manufacture, and test a prototype of a hammer mill suitable for small and medium enterprises. The hammer mill was designed and fabricated from locally available materials to grind feed raw materials such as corn cobs and corn kernels. The machine was driven using a diesel engine of 11 hp and equipped with two types of screens, with different size holes of 3 mm and 5 mm. The grinding process was achieved using a set of hammers in the crushing chamber. The material is crushed into small particles to pass through a semicircular screen hole under the crushing chamber. The results showed that the working capacity was in the range of 220 to 510 kg/h, depending on the kind of raw materials and the diameter of the screen used. The milling speed was in the range of 1954–1992 rpm. The fineness of the milled corn kernels and corn cobs were in the field of 0.105–2.380 mm and 0.125–2.380 mm, respectively. The fineness of the milled material depends on the size of the screen hole used. The fuel consumption for the grinding process was 1.10 l/h. [ABSTRACT FROM AUTHOR]