On February 20th, CIC technical department director Zhao Long and assistant director Ma Pengtao and technicians JiaoWenJun took concrete actions to service the frontine production works. In 2 days they designed and sucessfully made special tools to solve the knife vibration problems of 15 m hobbing machine in production process, ensuring the precision and progress of the large girth gear ring, and achieved the desired effect, which is highly praised by all.This is a "small invention" playing a big role.