Technical standards as they are defined in ISO 1940 are more and more insufficient for high-speed tools and spindle systems in order to guarantee a stable machining process. This paper shows the system-specific limitations of the component focused balancing. The effects of the unbalanced tool onto the machining process as well as the machine's behaviour can be used as system focused criteria in order to evaluate the required balancing status. These will be discussed by means of analytical andnumerical approaches and are verified by experimental results. The new aspect to set the balancing requirements by vibrational loads of the spindle bearings is confirmed by simulation models
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