This machine is a precision gear grinder with versatile adaptability. It is used for grinding spur and helical involute gears with toothmodification or without, and suitable for miner machinery, locomotive machinery, engineering and military industries to grind gears in single-piece or batch production.The machine works according to generating principle. The generating movement is resulted from worm gearing lead screw and change gears. The features of this generating transmission chain are good rigidity and easy to adjust.Programmable controller is employed in electric system.The speed of the ram stroke is controlled with a variable-frequency governor gear.Gears with the tooth modification such as tip and root relief and/or lead crowning and gear sectors can be ground on this machine, crowning is about max.0.072mm.Easy to operate and maintain.