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A method is described for calculating the chip flow direction in terms of the tool cutting edge geometry and the cutting conditions, namely feed and depth of cut. By defining an equivalent cutting edge based on the chip flow direction it is then shown how cutting forces can be predicted given the work material's flow stress and thermal properties. A comparison between experimental results obtained from bar turning tests and predicted values for a wide range of tool geometries and cutting conditions shows good agreement.

A model is presentedfor predicting the chipjow direction and cutting forcesfor bar turning with nose radius tools. A comparison which is made of predicted and experimental results shows excellent agreement.

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