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.
References
1.
KaminskiJ.CrafoordR.Positional accuracy of holes when drilling in inclined workpiece surfaces, Part 1: Experimental results. Proc. Instn Meek Engrs, Part B, 1994, 208(B2), 129–139.
2.
KaminskiJ.CrafoordR.Position accuracy of drilled holes. Ann. CIRP, 1991, 40(1), 503–506.
3.
KaminskiJ.Expert system for hole engineering with special reference to position accuracy when drilling. Thesis for the Degree of Licentiate of Engineering, Chalmers University of Technology, Gottenburg, Sweden, 1990.
4.
RubensteinC.LauW. S.WangM.The torque and thrust arising from the chisel edge and margins in spade drilling of ductile materials. Int. J. Mach. Tools Mf., 1989, 29, 441–452.
