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Positional Accuracy of Holes When Drilling in Inclined Workpiece Surfaces Part 2: Mathematical Force Model

In this paper, a drill wandering mechanism when drilling in inclined workpieces is described. A mathematical model for calculation of chip areas on the chisel edge and the lips has been developed and implemented by a computer. Simulations of the forces that occur on the contact areas between the drill tip and the workpiece are presented and discussed. A mathematical model for calculation of the resultant drill deflection, deviations in the drill axis of rotation and the position of its centre point as the drill penetrates the material is also proposed.