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@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@contesting.com> On Behalf Of
krgoodwin@comcast.net
Sent: Monday, December 21, 2020 3:52 PM
To: towertalk@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@sdellington.us
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