 Most machine tool builders source their CNC controls from partners such as Fanuc, Mitsubishi Electric, Siemens, and Heidenhain.Several builders have developed their own CNC controls over the years (including Mazak, Okuma, Haas, and others), but Okuma is unusual among machine tool builders for the degree to which it designs and builds all of its own hardware, software, and machine components.This is the company's "Single Source" philosophy.