It is repairing machine tools with high efficiency and high precision. Which were developed in our factory. They can be used for boring master bushing and can bushing of engine & generator’s cylinder body in automobiles tractors and ships and etc. If necessary, the flywheel hub bore and bushing seat hole can be also finly bored. In order to reduce auxilary manhours and labour intersity and guarantee machining quality,accessories for centering,sectifying tool,measuring inner diameter,boring rod bracket,tool holder to increase diameter,boring tool micro-adjuster and for distance tool sectifying device can be provided with the main machine