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In conventional friction tests, it is difficult to realize the high pressure and high temperature conditions of the tool-work contact area in cutting. In this study, the friction properties of machining fluids were evaluated using a friction coefficient calculated from the cutting force in micro feed end milling. The finished surface roughness in conventional end milling decreased with the friction coefficient of machining fluids obtained by this method. Also, the cutting speed dependence of the friction coefficient, and its influence on the biting property of the cutting edge can be evaluated by this method.

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