The development level of a country’s manufacturing is reflected by the machining quality of ultra-precision gear. Work principle of several gear-grinding and machining status of ultra-precision cylindrical involute gear at home and abroad are analyzed and compared

and machining of ultra-precision gear above quality 2(ISO1328-1997) is probed. China-made gear grinder Y7125 with big plan grinding wheel which is provided with the advantages of streamline structure

high rigidity of transmission chain

high accuracy of gear-grinding as well as being easy to modify

has the ability to be master grinder of ultra-precision cylindrical involute gear by a series of research work

which can produce ultra-precision gear from quality 2 to quality 1.