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The cutting force in machining creates bending stress in the boring bar. The induced stress in VDI integrated bars is greatest where the bar goes into the clamping. If the stress gets larger than the preload stress from the clamping mechanism, the VDI flange will lose its contact with the face of the clamping unit, and the machining operation will become unstable. The calculation below can tell you if the clamping force you have applied is sufficient to clamp a specific VDI integrated boring bar for the intended cutting data.
Since the cutting force has dynamic variations, a safety factor is included in the calculation to avoid problems caused by these variations. The safety factor is set to have a minimum value of 1.1, but you are free to set it higher.
The list on the right contains the material dependent value of the specific cutting force kc 0.4, which is valid for turning. Find the material you want to use and click on it to apply its kc 0.4 to the calculator below, or put in a value manually.
