What is dynamic balancing?

Why are some machines noisier and less efficient than others? Why does a car steering wheel vibrate at certain speeds?

Whilst the effects of unbalance can be undesirable in our everyday lives, they can have a critical impact on safety and efficiency in an industrial or manufacturing context.

What is "unbalance"?

Unbalance can occur in almost anything that rotates and is the uneven distribution of mass around the rotating object's axis of rotation. A rotor is said to be out of balance when its centre of mass is out of alignment with the centre of rotation.

Unbalance will result in the rotor exhibiting a wobbling movement, causing vibration that becomes increasingly harmful as the rotor gains speed.

So what about "balancing"?

Put simply, balancing is the act of spinning a rotor whilst using computer software to measure unbalance, and then correcting any unbalance detected by adding or removing counterbalancing material. Once sufficient material has been added or removed, the rotor will spin efficiently and vibration will reduce.

Static vs. dynamic balancing

An object is said to be in static balance when the centre of gravity is on the axis of rotation. In this scenario the rotating mass has no tendency to rotate due to the influence of gravity, and it will rest without turning at any angular position on its bearings.

A rotating mass would be considered to be dynamically balanced when no centrifugal force or couple is produced during rotation. A balanced system can rotate without requiring external force or couple other than that required to support its weight. Unbalance in such a system would place stress on the bearings, resulting in undesirable vibration.

Here at Burnley Balancing we're equipped to carry out both static and dynamic balancing.

Unbalance of unequal magnitude
Fig. A - unbalance of unequal magnitude, 130° out-of-phase
Unbalance of equal magnitude
Fig. B - unbalance of equal magnitude, 0° out-of-phase

Why balance?

An unbalanced rotating body will be unable to spin efficiently and will likely vibrate. Off-axis vibration forces cause noise, discomfort to machine operators and may exceed the design limits of individual machine components, reducing the service life of these parts. Unbalance can place the entire system at risk of catastrophic failure, particularly where the speed of rotation or mass of the rotating body is very high.

Balancing will improve the efficiency of any machine that depends on a rotor to function. It will also increase the service life of your machinery, lessen the risk of catastrophic failure of machine components and protect your staff from injury.

Static and dynamic balancing in the North West

Burnley Balancing are leading balancing specialists in the North West of England.

Located just off the M65 motorway in Burnley, we provide balancing services to clients locally and throughout the UK.

Experienced balancing engineers

From one-off agricultural balancing jobs to large-scale batch jobs for clients in the nuclear industry, the expert team at Burnley Balancing are ready to help.

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