[TowerTalk] FW: Thrust Bearing Installation

[K9MA]

The thrust bearing reduces the bending moment on the rotator, not the 
mast. With the rotator in the tower below the thrust bearing, there is 
very little bending moment on the rotator, just a horizontal force. 
There's also, of course, a vertical force, unless that is taken by the 
thrust bearing. The greater the distance between the thrust bearing and 
rotator, the smaller the horizontal force on the rotator.and thrust bearing.

73,
Scott K9MA




On 12/24/2020 3:37 AM, maflukey at gmail.com wrote:
> It's typically not about the dead weight of the mast & antennas, it's about
> reducing the bending moment on the mast under wind loading.
>
> 73
> Matt
> KM5VI
>
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of
> krgoodwin at comcast.net
> Sent: Monday, December 21, 2020 3:52 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Thrust Bearing Installation
>
> Installing a thrust bearing in a tower - Dead weight (along the gravity
> vector) all on the rotator or all on the thrust bearing?  Seeing such things
> as sleeves for towers, I would surmise that all of the dead weight is on the
> rotator and only off-axis loads (perpendicular to the gravity vector)  are
> handled by the thrust bearing.  I use two thrust bearings in my tower which
> I don't believe effects the answer to the above question.  Ken K5RG
>
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-- 
Scott  K9MA

k9ma at sdellington.us