Machining Dynamics by Tony L. Schmitz & K. Scott Smith

Author:Tony L. Schmitz & K. Scott Smith
Language: eng
Format: epub
ISBN: 9783319937076
Publisher: Springer International Publishing

In a Nutshell

Is it worth the extra effort to get the most accurate cutting force coefficients? The answer is—sometimes! It depends on your purpose. Even with a very crude force model, the dynamic behavior of the milling operation will be generally correctly captured. The good and bad speeds will be generally correct. However, the accuracy of the location of the stability boundary directly depends on the accuracy of the cutting force coefficients, just as it depends directly on the accuracy of the FRF measurement . The more accurately we want to know the boundary, the more accurately we need to know the data. Accurate knowledge of the cutting force coefficients introduces significant complexity.

Of course, what constitutes “ significant complexity ” is in the eye of the beholder. Most of the information about stable and unstable cutting conditions can be correctly deduced using the approximation that the cutting force is proportional to the frontal area of the chip through a single cutting force coefficient. Increasing the accuracy of the prediction requires increasing the complexity of the model and the amount of required information. Knowing where to draw the line in order to obtain an answer that is good enough is the essence of engineering. Different readers will have varying objectives and will draw that line in different places.

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