Yes it isn't really a thrust bearing, more of a bushing.
Goodness knows why it is called a thrust bearing! Maybe because it resists
side thrusts.
Mark N1UK
----- Original Message -----
From: "Wilson Lamb" <infomet@embarqmail.com>
To: "towertalk" <towertalk@contesting.com>
Sent: Sunday, 25 November, 2012 12:20 PM
Subject: [TowerTalk] Thrust Bearing
OK, I’m old.
I keep seeing the trem “thrust bearing” used for the bearing at the top of
towers, to take the side load of the mast.
AFAIK, thrust bearings take AXIAL loads, the load of the mast/antenna
going down the mast toward the rotor.
Car crankshafts have thrust bearings, ship propshafts have thrust
bearings, etc, so why should we be different?
Yes, thrust and radially loaded bearings can be built together, as in a
car engine, but that’s not what we have when a mast goes through a sleeve.
So am I behind the times? Do tower people speak their own language, or
what??
The Ham IV has 96 ball bearing balls, but they don’t bother to rate it for
axial load.
This little TV rotor
http://96.9.26.247/schemi/ACC_rotator/NTC_ECG_rotator_spec.pdf , however,
is rated for 100lb axial load, so I think the most of us with a tribander
and Ham XX won’t have a thrust problem.
Wilson
W4BOH
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