everything that rotates
                        needs to be balanced

 

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Vibration Information for rotating machinery applications.

 

Static Balancing

Friday, July 01, 2011

Static balancing was the primary method for balancing before more sophisticated machines became available that could dynamically measure imbalance in rotating parts. Static balancing can be accomplished by placing a part on knife edges; the part will usually rotate until the heaviest side rests at the bottom. Material can either be removed from the heavy side, or added to the opposite side to try and correct the imbalance. This process is repeated until the part can rest at any angle without turning.

Static balancing is more suited for non-critical machines where a rough balancing process is adequate e.g. car wheels are usually statically balanced and weights are added to the wheel rim to compensate for imbalances. High speed rotating equipment will typically have to be dynamically balanced, or else excessive vibration could lead to failure and/or damage.

Static balancing machines have advanced in terms of their form and function. Some of them are capable of detecting the heavy spot in a part without having it rotate. This is achieved using a set of sensors to detect the imbalance, or using a bubble level to indicate the heavy spot. The machines can even approximate the amount of mass imbalance that has to be corrected. This method is cheaper, albeit less accurate, than dynamic balancing.

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