A critical assessment of some steady-state models for predicting the cutting dynamics in accordance with the data obtained under simulated dynamic conditions

In order to be able to predict the stability limit in a machining operation, it is necessary to evaluate the cutting dynamics within an acceptable accuracy for a wide range of conditions. This may be done in two ways, either directly by obtaining the data while cutting with an oscillating tool which simulates unstable chatter vibrations, or indirectly by first obtaining the cutting data under steady-state conditions and then relating those steady-state parameters to the dynamic ones through a mathematical model. By means of a direct method, the dynamic cutting data were obtained for a number of conditions and presented in [1]. In this paper, the cutting dynamics were evaluated for the same conditions by using some steady-state mathematical models and the models were assessed in the light of the direct test results.