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Abstract
Tests with controlled-contact tools have shown that these tools behave as natural contact tools when small undeformed chip thickness-contact length ( t/ h) ratios are used. A distinct change in mechanism occurs when the t/ h ratio exceeds 0·6 for the conditions tested. The experimental values of coefficients of friction, shear angles and chip ratios are compared with those derived from two theoretical analyses. It is shown that Oxley's analysis is not substantiated by experiment while Usui and Hoshi's slip line field solution shows partial correlation with experimental data.
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