In recent years, customer demand has been increasing for machining tools that offer higher cutting performance and productivity with reduced non-cutting periods for medium- and large-part machining processes. To address such machining needs in manufacturing facilities, Mitsubishi Heavy Industries, Ltd. (MHI) developed the MAF150R, a floor type horizontal boring mill that provides both heavy-cutting performance and short non-cutting periods. MHI designed this machine by making full use of its FEM analysis technology. In this paper, we describe the technologies used for this machining tool and present actual machining examples.