KEVOS® MAKEOS · Maintenance
Shaft Angular Offset
What angular misalignment does this offset across a known span represent?
Convert a relative offset change measured across a known axial span into an angular misalignment.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Relative offset change across the span | mm | Actual change in relative offset between the two measurement planes. For a rim reading, use half the total indicator reading. |
| Axial span between measurement planes | mm | Axial distance between the two measurement planes. |
Method and formulas
- Angle = arctan(offset change / span).
- Slope (mm per 100 mm) = 100 × offset change / span.
- Example: 0.15 mm across 100 mm gives 0.15 mm per 100 mm, 1.499999 mrad or 0.085944°.
Limitations
- Offset (parallel) misalignment, soft foot and thermal growth between cold and running conditions are not included.
- Acceptable misalignment comes from the coupling and machine manufacturers; none is applied here.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Express alignment readings as an angle or slope
- Compare readings with a coupling maker’s tolerance
- Check a shim calculation
Who it is for
- Maintenance engineers
- Design engineers
What you get
- Angular misalignment (degrees and mrad)
- Slope (mm per 100 mm)
Interpreting the result
- Alignment tolerances are often given as a slope (mm per 100 mm) for angularity and a distance for offset.
References
- Piotrowski J., Shaft Alignment Handbook, 3rd edition (CRC Press, 2006). Topic reference; no source tables or tolerances are reproduced.
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