In recent years, many industries have been trying to introduce gear grinding machines, backed by the increasing demands for low-noise gears in automotive transmissions and for high-precision large gears in construction machines, gearbox for wind turbine systems, and printing machines. To address these demands, Mitsubishi Heavy Industries, Ltd. (MHI) has developed and added to its product line-up two gear grinder products: the ZE series for mass production of small gears and the ZG series for medium and large sized gears. This document describes the features of these products from the technical standpoint and explores the future prospects of gear grinding because it is anticipated that more manufacturers will adopt this machining technique.