I am getting very low imbalance but high angle. Why?

It's quite normal to see a very low unbalance value and a high angle simultaneously during a balancing procedure. This is usually an indication that the part is very well balanced and the remaining unbalance is at an acceptable level. Since unbalance is a vector quantity, it has both a value (magnitude) and a direction (angle). If the unbalance value is very close to zero, the machine attempts to measure the angle of a very small remaining unbalance. In this case, even a minor measurement error or environmental noise can cause the angle to appear as a random value.

This situation does not mean the machine is malfunctioning; on the contrary, it indicates that the process has been completed with precision and the part is within its tolerance range. The residual unbalance is so minute that even small imperfections or surface roughness on the part can affect the machine's angle measurement. What's important is that the unbalance value you get is below the acceptable tolerance set for the part. If the value is within tolerance, the part is considered balanced and can be used safely, regardless of the angle. At MBS Balance, our machines clearly demonstrate this, allowing the user to understand that the result of the procedure is reliable.

The mathematical explanation of this phenomenon is that the unbalance vector comes very close to the origin in the polar plane. As the length of the vector (amount) approaches zero, the components that determine its direction (angle) drop to the same order as the measurement noise, and the angle becomes unstable, even variable from measurement to measurement. In other words, a large angle is not an error but a sign that the unbalance has become small enough to be negligible.

The practical rule is clear: if the residual unbalance amount is inside the tolerance circle determined for the part (and the machine's Umar limit), the value of the angle is irrelevant and there is no need to continue correcting. Adding weight at this point often introduces a new error instead of reducing the unbalance. The polar display and tolerance circle of MBS Balance machines allow the operator to distinguish this situation at a glance and approve the part with confidence.