The notion that a balanced toolholder assembly is essential for chatter-free machining at high spindle speeds is an easy concept to grasp. An unbalanced rotating assembly creates centrifugal forces that increase by the square of the machine’s spindle speed. These centrifugal forces create greater vibration at high spindle speeds, which causes poor Tungsten Steel Inserts surface finish and decreases tool and spindle life.
Similarly, machine tools that operate at relatively low spindle speeds can benefit from using balanced toolholder assemblies. In fact, the reason why a machine operates at a low spindle speed may be because the toolholder assembly is unbalanced. In these circumstances, it can be difficult to improve cycle times because any increase in spindle speed likely would drastically reduce cutting tool life.
There is value in using pre-balanced toolholders on both high- and low-speed machines. That said, Brendt Holden, president of Haimer USA (Villa Park, Illinois), believes shops should consider the importance of balancing all toolholders after the cutting tool and other related components have been installed. Depending on Cemented Carbide Inserts the application, it may be necessary to re-balance even a balanced toolholder after adding pull studs, collets, clamping nuts, data chips and so on. This is often the case when using inherently unbalanced asymmetrical tools, such as a tool that has a flat on its shank.
In addition to improved cutting tool life and surface finish, Mr. Holden offers the following reasons why shops should consider an in-house balancing system for toolholder assemblies used on low-rpm machine tools.
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