Abstract
Machined surfaces are usually characterized by the presence of sub-surface plastic deformation. In the present study, orthogonal cutting tools having exaggeratedly large edge radii (model tools) were used to machine aluminium, zinc and brass workpieces at various cutting speeds (32 in./min and 50–300 ft/min). The experimental results are in general agreement with the approximate theoretical prediction of von Turkovich 1, which states that the depth of the deformed layer is equal to F 3K , F being the resultant cutting force and K the dynamic yield shear stress.
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