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Increased system‐service life and reliability and reduced running noise can be achieved
through the least possible radial and angular misalignment.
The coupling parts may get out of alignment
•
due to imprecise alignment during assembly or installation
•
during operation of the system due to:
─ heat expansion, shaft flexure, too weak machine frames, etc.
ΔKa
Axial misalignment
(ΔKa)
Fig. 19: Possible misalignments
Alignment has to be done in two axial planes arranged perpendicularly to each other. This can be done by
means of a ruler (radial misalignment) and feeler gauge (angular misalignment), as shown in the
illustration. The aligning accuracy can be increased by using a dial gauge or a laser alignment system.
Fig. 20: Example of alignment on a flexible coupling
1
Ruler
The maximum permissible misalignment values are specified in the operating
instructions for the coupling; they must under no circumstances be exceeded during
operation.
Angular and radial misalignments may occur at the same time. The sum of both
misalignments must not exceed the maximum permissible value of the angular or
radial misalignment.
If you use couplings manufactured by other manufacturers, ask these manufacturers
which alignment errors are permissible, stating the radial loads occurring.
For alignment of the drive components (vertical direction), it is recommended to use packing
or foil plates underneath the mounting feet. The use of claws with set screws on the foundation
for lateral adjustment of the drive components is also advantageous.
Angular misalignment
(ΔKw)
3
1
3
2
2
Feeler gauge
BA 5200 EN 08/2010
42 / 65
Radial misalignment
(ΔKr)
3
3
3
Measuring points
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