grinding workshop was founded in 2003 and had formally put into production in july, at the same year. grinding equipments are all adopt niles series which made in germany. at present, there are 13 grinding machines, which include eleven external grinding machines, one inner shaped machine and one worm wheel gear grinding machine. the maximum machining diameter of grinding machine is 8 meters and the maximum modulus is 40, the largest helix angle is 40 °. the maximum machining diameter of worm wheel gear grinding machine is 1 meter.