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  • 7/28/2019 Information About Machine Unbalance

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    7/7/13 Information About Machine Unbalance

    www.usedvibration.com/machine_unbalance.htm 1/2

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    Centrifugal force acts upon the entire mass of a rotating component,

    impelling each particle outward and away from the axis of rotation in a radial

    direction. If the mass of a rotating component is evenly distributed about its

    shaft axis, the part is "balanced" and rotates without vibration. However, if an

    excess of mass exists on one side of a rotor, the centrifugal force acting

    upon this heavy side exceeds the centrifugal force exerted by the light side

    and pulls the entire rotor in the direction of the heavy side.

    An unbalanced rotorwill cause vibration and stress in the rotor itself and in

    its supporting structure. Balancing of the rotor is therefore necessary.

    Unbalance in just one rotating component of an assembly may cause theentire assembly to vibrate. This induced vibration in turn may cause

    excessive wear in bearings, bushings, shafts, spindles, gears, etc.,

    substantially reducing their service life. Vibrations setup highly undesirable

    alternating stresses in structural supports and housings which may

    eventually lead to their complete failure. Performance is decreased because

    of the absorption of energy by the supporting structure. Vibrations may be

    transmitted through the floor to adjacent machinery and seriously impair its

    accuracy or proper functioning. Vibration Analysis Technical Papers

    Machine Balancing Standards ISO1949 and ANSI219

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