Javascript Menu by
Schenck Limited

Couple unbalances

Two unbalances (shown here as arrows) can have the same size, but their angular position is offset by precisely 180° to each other. This unbalance distribution cannot be detected by knife edges as with static unbalance, because the rotor does not take up a unique position at rest. The rotating rotor executes a wobbling movement about its vertical axis (perpendicular to the axis of rotation), because the two unbalances exert a moment. Ergo, this type of unbalance distribution is called couple (moment) unbalance.

An opposing moment is required to correct the couple unbalance, i.e. two equi-sized correcting unbalances, which are arranged in the two balancing planes at an offset of 180°, corresponding to the original unbalance. It is particularly important to take couple unbalances into account in elongated cylindrical rotors. Therefore, horizontal balancing machines are particularly suitable for correcting this type of unbalance

Balancing 100 years with Schenck

In 1907 Schenck produced their first balancing machine. In previous years Carl Schenck had been involved with this topic and with the co-operation of Franz Lawaczeck the first practical machine was completed.

For further important milestones in the history of balancing look here.

Balancing 100 years with Schenck