The amount of back knife is determined according to the stiffness of the machine tool, workpiece and tool. Under the condition of permissible rigidity, the amount of the back tool should be equal to the machining allowance of the workpiece. This can reduce the number of passes and increase the production efficiency. In order to ensure the quality of the processing surface, can leave a small amount of finishing allowance, generally 0.2 – 0.5mm.

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