The cutting length is affected by the position of the milling cutter. Tool life is often related to the cutting length that the cutting edge must bear. The cutting length of the milling cutter positioned in the center of the workpiece is short. If the milling cutter deviates from the center line in any direction, the cutting arc will be long. To remember how cutting forces work, a compromise must be reached. When the tool is positioned in the center of the workpiece, the direction of the radial cutting force changes when the cutting edge of the blade enters or exits the cutting. The clearance of machine tool spindle also intensifies the vibration, resulting in blade vibration.


By deviating the tool from the center, a constant and advantageous direction of cutting force can be obtained. The longer the overhang is, the more important it is to overcome all possible vibrations.