Mounting errors in eccentricity and perpendicularity move the CG
of the part (Center of Gravity) away from the axis of rotation,
thereby introducing unbalance (which is the same as mass eccentricity)
The displacement of the CG causes balance
measurement errors.
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| A
closer look at the fan hub reveals the impact of eccentricity and
perpendicularity |
| When the fan hub is mounted in the exact
center and perpendicular to the shaft, the CG of the fan is in line
with the axis of rotation:
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A slight tilting of the fan causes the CG to move
away from the axis of rotation
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When tilting and eccentricity are combined, the CG
displacement is even greater
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