[TowerTalk] Bearings for Axial Load

Roger (K8RI) on TT K8RI-on-TowerTalk at tm.net
Sat Jul 15 22:50:21 EDT 2017

Good point. A sleeve for side forces and a plate for vertical load. IOW 
a "T" with a hole through the center.
There are taper bearings meant for slow rotation, but I think the 
"plastic" (Filled Teflon or Delrin). Plain Teflon cold flows and is not 
dimensionaly  stable under pressure.  I'd be suspicious of a metal 
sleeve with expansion and contraction due to temperature swings

I have a lot of experience using both, but that was over 40? years ago.

73, Roger (K8RI)

On 7/15/2017 Saturday 12:57 PM, Charles Gallo wrote:
> This whole thing brings me back to one of my hobby horses.
> Why are we using ball/roller/taper bearings for this use?
> A nice hat section (inverted) plastic bearing (cheap if molded, more expensive if machined due to waste) made of say nylon 66, or even Teflon (particularly if filled) would be way better. They won't fret from vibration, never need lube, designed right won't see sunlight, never corrode , and would probably be less expensive in production quantities (see molded). I could build something that doesn't use solids, but multiple pieces of rod ends that would have more labor, but less material cost
> Ball/roller bearings are great, but are really the wrong thing for an intermittent duty, low speed, weather exposed, hard to maintain environment, with vibration and shock when stopped
> --
> 73 de KG2V
> Charlie
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Roger (K8RI)

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