A geometric approach to milling stability uncertainty

Deterministic solutions for the milling stability boundary are provided by frequency-domain, time-domain, and semi-discretization methods. While these deterministic solutions are valuable, it is essential to consider the uncertainty in the predicted stability boundary to enable optimum milling parameter selection. Prior efforts have implemented Type A (statistical) uncertainty evaluations. This paper provides a Type B (other means) analysis, where the stability uncertainty is represented by offset boundaries based on user-selected uncertainties in spindle speed and axial depth. The geometric approach is demonstrated for a selected milling system using a frequency domain stability solution.