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Bearing for Pointy-Top Towers

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Subject: Bearing for Pointy-Top Towers
From: (
Date: Tue, 14 Jan 1997 14:10:20 -0500 (EST)
In a message dated 97-01-14 12:36:22 EST, you write:

>Has anyone developed a thrust bearing for a pointy-top tower that sits ontop
>the the throat of the point-top?  
>It would seem to me that could work
      In a word, no.  There are only a few outdoor-suitable thrust bearings
available to begin with and they all need a plate on which to sit, not
mounted on top of a pipe.

    Your solution is to use an AS25/45G accessory shelf/rotor shelf for your
tower.  Drill it out for the thrust bearing mounting holes and mount it in
the tower between the rotator and the  top of the tower.  It works FB.

     This technique also works very well for big mast/antenna installations.
This would be a case where your center of mast/antenna gravity is above the
top of the tower.  In this case, the tower mounted thrust bearing will be the
second bearing in the system.  The advantage of this is that it makes it very
easy to swap rotators since the whole mast/antenna system is captured by the
second bearing.  

73,  Steve  K7LXC

    TOWER TECH -- professional tower supplies and services for amateurs

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