Comparison of two methods to calculate spindle compliance considering machine frame influence

摘要

Dynamic compliance evaluated at the spindle front or tool tip represents an important parameter, based on which regions of stable machining can be predicted. Usually, calculation of dynamic compliance is performed taking into account mechanical system of spindle and tool only, whereby the influence of machine frame is omitted. However, in the real machining process, especially when using big roughing tools, cutting forces can excite the whole machine tool structure. Under such conditions, machine frame compliance may become critical one and chatter may originate mainly due to the machine frame vibration. The paper describes two possible approaches to calculate the spindle compliance considering the machine frame. Influence of the machine frame on the dynamic compliance evaluated at the tool tip is demonstrated on an example of a real machine tool model.