The permitted shaft misalignments ?Ka, ?Kr and ?Kw are maximum values and must not occur at the same time (see following table). The specified, permitted shaft misalignment ?Kr for types NEN/NHN and MFEFM/MFHFM applies to a shaft distance of S = 1000 mm (ARC-8) or S = 1500 mm (ARC-10). The permitted shaft misalignment ?Kr for types NEN and NHN is calculated as follows: ?Kr = (S – S1) · tan(?Kw). The permitted shaft misalignment ?Kr for types MFEFM and MFHFM is calculated as follows: ?Kr = (S – S1 – 2 · BF) · tan(?Kw).
The values for torsional stiffness apply to the complete coupling. In the case of types NHN and MFHFM to a coupling with shaft distance S = 1000 mm (ARC-8) or S = 1500 mm (ARC-10). The torsional stiffness of the plate packs applies to the rated coupling torque TKN. To determine the torsional stiffness for a specific operating point, e.g. for calculating torsional vibration, the manufacturer must be consulted.
