Ultra precision machining and testing technology is an important symbol of national manufacturing level, the foundation and the key is the advanced equipment manufacturing technology, a key role in many important areas of industrial production, aerospace, has an important strategic position. The gear accuracy directly affects the accuracy of the whole mechanical engineering equipment, concrete is divided into 12 levels, including more than 5 precision gear is mainly used in ultra precision machine tools, radar and aerospace engine with high speed transmission Gaoping steady requirement; 2 grade precision above base of standard gear, mainly as a national or international gear measurement instrument calibration and accuracy transfer entity reference.

The gear precision the most advanced countries in the world to reach 2, has not yet achieved the development and testing of 1 grade precision master gear. Wang Liding team tackled key technical innovation design, the key parts of the ultra precision gear grinding machine standard ultra precision gear machining process, completed the rebuilding of standard gear grinding machine, to enhance the implementation of ultra precision master gear machining accuracy and precision measurement technology, developed a series of 1 grade precision gear standard, to fill the domestic blank. At present, 1 grade precision standard gear has been used as standard material, was used to Chinese Institute of Metrology and enterprise proofreading and high precision gear measurement instrument of value transfer, resulting in significant social benefits, which has important application value.