Orifice plates, grinding machines, and method of using the same are provided that can process a material. In one aspect, an orifice plate includes multiple orifices, at least one of which has two tapered segments aligned with and operably connected to each other and that taper downwardly from respective outer portions to inner portions. An intermediate bore may connect to minimum diameter portions of each of the tapering segments so that the tapering segments are connected to each other by way of the intermediate bore.
