It had long recognized the importance of balancing the performance of the boring tool for boring quality. In today's high-speed cutting conditions, the balance of the boring tool becomes more prominent than in the past, even a small tool unbalance may be greatly affected by processing aperture size, surface finish, roundness and tool life. Furthermore, unbalance may cause the cutting tool chatter. In recent years, many of the standard boring tool are fitted with balancing mechanism, such institutions often by a movable counterweight blocks, due to the imbalance boring tool is mainly caused by the processing aperture changes, so you can set up according to the boring tool the tool set of processing aperture counterweight can be adjusted. This approach, although effective for maintaining balance tool, but rather takes hours. In addition, this tool balancing device located outside, exposed to the coolant, chips and oil, it is very susceptible to damage.

Self-balancing mechanism installed inside the new boring tool can be a good solution to this problem. When the clamping adjustable blade holder to adjust the aperture to move in a certain direction, the inner boring head with a mechanical counterweight block connections are moving in the opposite direction at the same time, in order to maintain the balance of the boring tool. The built-in self-balancing mechanism is sealed within the boring head, with coolant and chips completely isolated.