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Thursday, 22 October 2009 01:00
The term ‘static’ dates back to the days before sophisticated balancing machines were available to measure unbalance. Rotors were placed on knife edges (on a mandrel if required) and the unbalance would cause the heavy spot of a rotor (unbalance) to fall to the bottom through the force of gravity. The unbalance could therefore be identified without the need to drive the rotor, or in another term whilst ‘static’. When the heavy spot had fallen to the bottom, weight would be added at the top or removed at the bottom and the rotor would be rotated, and where required, the process would be repeated until the rotor remained stationary at any angle it was positioned at (balanced).
Friday, 01 May 2009 16:24
One of the most important rules in dynamic balancing is that for every one micron (0.001mm) of error you will see 1gmm (gram millimetre) of unbalance per kg. This rule can be used when designing or selecting what type of tooling to use for your dynamic balancing application or it can be used to calculate what expected unbalance you will see if a part has location clearance or displaced from its rotational axis.
