Basic Aspects of Inclined or Oblique Wood Cutting

In cutting a moderately dense wood with rake angles and edge radii in the practical range, the cutting force decreases rapidly as the tangent of the inclination angle increases from zero to about 5, then it stabilizes at about 50 percent of its value at zero inclination. In dense woods such as ironbark, the splitting is shallow and disappears at quite low inclinations, whereas in low density woods, the splitting is deep at low inclinations and is eliminated only at very high inclinations. In low density woods, increasing the rake angle and decreasing the edge radius greatly reduces the inclination at which the splitting disappears. The benefits of inclination are primarily due to avoiding the spread of stress and the resulting high deflections which normally occur as an edge of finite radius advances into a cellular, highly anistropic material such as wood.

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