Overrunning cages are expedient to use if a short table is to be moved on a long guideway track. As a result, the upper part is at all times supported over its entire length, which has a positive effect on the load carrying capacity and rigidity.
Close-up view of run-ins rounded (EG)
So that the cage run-in causes as little pulsation as possible, the short rails are provided with rounded run-ins. The run-ins are ground following manufacture of the guideway track.
Application diagram of a short table on a long guideway
Note:
On rare occasions (e.g. under very high preload), in spite of rounded run-ins the pulsation of the overrunning cage can have a disruptive effect on the application. This phenomenon can be largely eliminated by taking appropriate measures (on request).