It is well known that when the turning tool is installed, its tip should be aligned with the center of the workpiece. However, when a young worker is turning the slender shaft, the workpiece is vibrated when the turning tool tip is aligned with the center of the workpiece, and the vibration is lost when the turning tool tip is raised in an appropriate amount. If it is raised again, it cannot be cut, and then the tool cracks. He did not know why this happened. First, the effect of the back angle and the principle of vibration elimination The principle of the above phenomenon is very simple, because under normal circumstances, the tool is ground with a front angle and a back angle. The function of the back angle is to reduce the friction between the tool flank and the workpiece. When aligning the center of the workpiece,
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