Advanced Turning

Boring bars need to enter the workpiece to machine, therefore enforcing limitations on the shank diameter and tool overhang. The larger the L / D overhang ratio a boring bar has, the deeper it can machine, but as a consequence it can easily suffer from vibration (chattering). To prevent vibration, selecting the appropriate shank material and reducing the cutting resistance are important factors to consider.


In comparison with an external tool holder the overhang of a boring bar is a lot longer and as such is prone to vibrations due to cutting resistance.


If the cutting edge of the insert is too sharp then the back force can sometimes work in the negative direction. This can lead to a reduction in the surface finish.

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Vibrations and cutting resistance of boring bars