Axial And Radial Forces - Siemens SIMOTICS GP series Operating Instructions Manual

Shaft extensions with feather key
To maintain the balancing quality, you have the following options:
● If the transmission element is shorter than the feather key with balancing type "H", then
you must machine off the section of feather key protruding from the shaft contour and
transmission element in order to maintain the balance quality.
● If the transmission element is drawn up on to the shoulder of the shaft, you must ensure
that the part of the coupling groove where the feather key is not inserted is taken into
consideration when balancing the coupling.
The following applies to all four-pole machines with a frequency ≥ 60 Hz:
● The feather key must be shortened if the coupling hub is shorter than the feather key.
● The center of gravity of the coupling half should be within the length of the shaft end.
● The coupling used must be prepared for system balancing.
Danger as a result of a feather key being flung out
Rotating parts are dangerous. The feather keys are only locked against falling out during
shipping. If a machine with 2 shaft extensions does not have an output element on one shaft
extension, the feather key can be flung out during operation. Rotating parts can result in
death, serious injury or material damage.
● Do not operate the machine unless the transmission elements have been pulled on.
● On shaft extensions without drive output element, take suitable measures to ensure that
the feather key cannot be flung out. For balancing type "H", shorten the feather key by
about half.
5.4.5

Axial and radial forces

You can obtain the permissible values for axial and radial forces by contacting the Service
Center or referring to the machine catalog.
Standard motors SH 63 ... 355
Operating Instructions, 12/2018, A5E38483075A
Assembly
5.4 Installing the machine
59