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Shaft Deflection
The deflection of the shaft has to be limited to within the misalignment limits of the bearing and seal assemblies.
The calculation of shaft deflection is based on a simply supported beam.
| q = | 0.083373 x P x c x ℓ |
| d4 |
| q = Shaft deflection (arc minutes) | P = Load on roll (N) |
| c = Support distance (mm) | ℓ = Bearing centres (mm) |
| d = Shaft Diameter (mm) | |
In general the following bearing misalignments are allowable:
| Bearing type |
Allowable misalignment |
Value used in calculation |
| Taper Roller Bearing | 2 minutes | |
| Deep Groove Ball Bearing | 2 - 10 minutes | 8 minutes |
| Seize Resistant Bearing | Up to 13 minutes | 10 minutes |
Note: 1 arc minute = 1/60 Degree