[TowerTalk] Thrust Bearing

[Mark Robinson]

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 at embarqmail.com>
To: "towertalk" <towertalk at 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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