[TowerTalk] Thrust Bearings

[Roger (K8RI) on TT]

I beg to differ. You can purchase "thrust bearings" that are designed 
for lateral loads,  axial loads and both. The TB 3 and 4 are  examples 
of the both. Look at the way the races are designed.  Wiki does say 
"predominately" as the number used in towers is a fraction of a % of 
regular thrust bearings.

Using a thrust bearing that holds axial loads can be poison for many 
rotators designed to run with a positive load.  Take the ham series, use 
an Aluminum mast, added a thrust bearing 10' above the rotator.  If 
installed on a warm day, in winter the Al shrinks far more than the 
steel does and will remove the vertical load on the rotator. It can even 
pull up on the bell.
Most amateur installations do not need axial load thrust bearings except 
to hold the mast when removing rotators.
Clutches (throw out bearings) and cranks use bearings designed for axial 
thrust.

Prop bearings on the front of an airplane crank have to withstand 
tremendous lateral loads. When you are pulling 2Gs in a 60 degree bank, 
level turn, the gyroscopic action from that pig prop exerts tremendous 
pressure as it tries to tilt.

73

Roger  (LK8RI)


On 11/1/2015 11:39 AM, Wilson wrote:
> Can we get this terminology right?
> Thrust bearings take AXIAL loads off members, like the prop shaft on a ship.
> They don’t take lateral loads as a main function.
> Yes, there are some ball and roller bearings with tilted races that can take some lateral load.
> I don’t know if they have a special name?
> https://en.wikipedia.org/wiki/Thrust_bearing
> Even your auto’s crankshaft has a thrust bearing!
> WL
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73

Roger (K8RI)


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