Imbalances in your tool quickly become a problem in several ways: they cause the tool to run out of round, put strain on the spindle and machine, impair machining performance, and ultimately compromise the reliability of your entire process.

The term “imbalance” describes the common phenomenon in rotating bodies where their mass is not distributed symmetrically about the body. There are essentially three types of imbalance:

• Static imbalance: Here, the center of mass of the rotating body lies outside the axis of rotation. This can already be measured when the body is at rest.
• Moment imbalance: The center of gravity lies on the axis of rotation; the imbalance becomes measurable only during rotational motion.
• Dynamic imbalance: The term "dynamic imbalance" encompasses the other two forms of imbalance, in any combination of static imbalance and moment imbalance. This is the norm for technical rotors.

Each specific form of imbalance can be compensated for by making appropriate adjustments to the rotating body.

During rotation, an imbalance becomes more noticeable the greater the imbalance is (linear increase) and the faster the rotational motion is (quadratic increase). The faster the rotational motion, the more important balancing becomes, and the more important it is to reduce residual imbalance as much as possible. Balancing should therefore be systematically incorporated into the work process.

In high-speed machining of workpieces using rotating tool systems, even the slightest inaccuracy or lack of precision can become very apparent very quickly under certain conditions. An imbalance in the tool can cause vibrations and will certainly result in erratic operation.

Both factors impair the accuracy with which the tool operates and always increase the risk of artifacts and damage to the workpiece: surface finish deteriorates, and scrap may result. However, since your processes rely heavily on producing correctly machined end results, tools that are not finely balanced necessitate more extensive quality controls. Rework may also be necessary, and in any case, process reliability is not guaranteed.

As a rule of thumb, therefore: It’s better to balance tools early and often than to end up paying the price later. In general, a tool should be rebalanced whenever it is used at a different speed—since even this change can cause significant differences in smoothness of operation.

Regular balancing increases productivity and the quality of your work.

The balancing system then uses this measurement data to calculate the required correction. With an advanced balancing machine, the necessary adjustments can be made immediately; the fine-balancing process continues until no residual imbalance is detectable or all values fall within an acceptable tolerance range.

In this way, balancing does not even take particularly long, and the unevenly distributed mass can be quickly compensated for.

A highly accurate and largely automatic balancing system is also beneficial because it allows tools to be rebalanced quickly and efficiently with every changeover. This prevents quality losses caused by changing requirements, speeds, or materials, without compromising work efficiency.