Can Zero Gram Zero Degree Balancing Be Done?

Technically, it is not possible to achieve "zero grams, zero degrees" balancing in the dynamic balancing process. This is because every rotor or part has a minimal mass unbalance due to manufacturing and machining tolerances. This unbalance can never be completely zeroed out. In addition, there is always a certain margin of error inherent in the precision of the measurement devices, sensors, and software used. Therefore, the balancing process aims not to completely eliminate a part's unbalance, but to reduce it to a predetermined tolerance range.

For example, if a part's tolerance is set at 20 gmm, the remaining unbalance after balancing can be any value between 0 and 20 gmm. This effectively means the part is "zero balanced" in a practical sense, as the remaining unbalance is below the acceptable level for operational requirements. The process is finalized by positioning this residual unbalance at an angle that keeps it within the determined tolerance. At MBS Balance, our machines are designed to achieve these tolerance levels with high precision. This approach not only ensures you get the most accurate results but also increases your production efficiency by preventing unnecessary time and cost loss.

The physical limit against reaching zero is both the part's unavoidable manufacturing tolerances and the machine's own minimum achievable residual unbalance. Defined in ISO 21940-21 as Umar (minimum achievable residual unbalance), this value specifies the smallest unbalance a balancing machine can measure and correct; your target tolerance cannot go below Umar. For this reason, when selecting a machine, the part's permissible residual unbalance is required to be at least several times above the machine's Umar value.

Trying to reduce the residual unbalance to zero means both an unnecessary waste of time and the risk of introducing new error during correction. The correct approach is to safely bring the unbalance inside the tolerance circle and finish the process there. MBS Balance machines show the tolerance circle on the screen and consider the process complete when the residual vector falls inside this circle; this preserves both precision and productivity together.