Abstract
There are three basic components without which predictive maintenance program is not complete; they are: detection, analysis, and correction. It has been viewed that a very large percentage of machinery vibrations are due to unbalance and misalignment alone. Thus, the chapter briefly discusses the correction of these common faults. It is very rare to come across a vibration spectrum of a machine that does not show a l x component indicating some residual unbalance. Unbalance causes high levels of vibration amplitudes at the l x rpm of the machine. Unbalance is often defined as simply the unequal distribution of weight about a rotor's centerline. The main causes for unbalance during manufacture are: materials do not have uniform density and holes are not bored exactly parallel to the center. Unbalance can also occur during normal operation of machines, such as when there is an uneven product deposition around a fan or pump impeller. To improve an unbalanced rotor, it is necessary to determine the location and weight of the heavy spot. The heavy spot is the radial location where the excessive radial mass distribution exists. Further, the chapter also explains various balancing methods.
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