<P> Static deflections for several types of uniform - cross-section beams can be found here . If a beam has multiple types of loading, deflections can be found for each, and then summed . If the shaft diameter changes along its length, deflection calculations become much more difficult . </P> <P> The static deflection expresses the relationship between rigidity of the shaft and inertial forces; it includes all the loads applied to the shaft when placed horizontally . However, the relationship is valid no matter what the orientation of the shaft is . </P> <P> Critical speed depends upon the magnitude and location of the shaft unbalance, the length of the shaft, its diameter, and the kind of bearing support . Many practical applications suggest as good practice that the maximum operating speed should not exceed 75% of the critical speed; however, there are cases that require speeds above the critical speed to work correctly . In such cases, it is important to accelerate the shaft through the first natural frequency quickly so that large deflections don't develop . </P>

The factor which affects the critical speed of a shaft is
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