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  • Why can some Balancing Systems measure without actually spinning the part?

  • What determines the need for a “spin balancer”?

 

A disk-shaped body can only have "single-plane" or static unbalance

Because this rotating body is rather thin (shaped like a disk), both Weight A and Weight B appear to be located in the same plane of rotation.

 

(It is the same condition as in the next picture, with both weights in the same plane of rotation)

Centrifugal forces generated by both weights are acting in the same plane of rotation.

Because of this, the combination of both weights acts as if it were indeed combined to one weight.

The Result:

Static Unbalance

 

 
In this picture, both Weight A and Weight B are located in the same plane of rotation

Centrifugal forces generated by both weights are acting in the same plane of rotation.

Because of this, the combination of both weights acts as if it were indeed combined in one weight.

The Result:

Static Unbalance

 

Static unbalance, regardless of the shape of the rotating body,  can be detected and measured with a static or non-rotating balancer