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Force is often used as the feedback signal in process control systems, while feed (or feedrate) is the controlled machining variable. The normal force is directly related to the chip load, which is proportional to the feed. Experiments were designed to observe the force response to step changes in commanded feed. An empirical dynamic model of the cutting process was developed relating actual feed...
The characteristics of the computer numerical controlled cutting process can be described by a nonlinear dynamical system in the presence of the parameter variation. When the cutting operation proceeds, process model parameters can be changed in response to the machining requirements. This may lead the system to the bad machining performance or instability. On the basis of the variable structure system...
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