The main reason for the imbalance of the tool holder

The main reason for the four-axis CNC machining is the asymmetry of the tool design, the defect in the tool body, and all the adjustments on the tool. A correctly balanced tool can significantly reduce noise and vibration, which leads to increased tool life and better part accuracy consistency.
The centrifugal force of the four-axis CNC machining center magnifies the vibration caused by the imbalance in a relationship proportional to the square of the speed. The increased vibration of the CNC machining center caused by the machining center minimizes the life of bearing bushes, bearings, shafts, spindles and gears.
Before balancing the tool on the CNC machining center, it is necessary to measure the size of the unbalance and the angular position of each selected correction plane. These variables are measured on two general types of balance machines: non-rotating or gravity machines are used to measure unbalance in a single plane, and rotating or centrifuges are used to measure unbalance in a single plane or two planes.
After measuring the size and angle of the unbalance on the correct plane, you can correct it by adding or removing material from the workpiece. For machining centers that are not tools, the most widely used material addition method for drilling and tapping centers is to weld counterweights on the components.
Four-axis CNC machining other methods for slightly unbalanced components include adding solder on the component body or adding weight in the pre-drilled hole. For the tool, when you determine the imbalance that you determine that you must remove the material to get the correct balance, the easiest and most effective method is drilling.
This is a quick adjustment, and the amount of material removal can be precisely controlled. Another option is milling, which is the most effective way to balance thin-walled tools or where shallow cutting is mandatory.

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