Abstract: The present invention is directed to a sandwich design crushing/shredding machine. The machine comprises a stationary grid and a rotatable set of blades on a shaft. The stationary grid is adapted for connection into a flow line, has a first flange and a second flange, and an attachment means attaching the first flange to the second flange in face-to-face relationship. The first flange has an open inner portion. The second flange has a grid inner portion of the same general shape as the open inner portion of the first flange, and a number of parallel grid openings. The attached first and second flanges have a bore extending diametrically through the flanges. A rotatable set of blades on a shaft extends axially through the bore, and is adapted for rotation by an exterior power source. Each blade corresponds to a grid opening and is positioned along the shaft within its grid opening.