[TowerTalk] Bearings for Axial Load

[Grant Saviers]

TFE is very UV resistant.  Promoted to replace glass on solar panels.
https://www.chemours.com/Teflon_Industrial/en_US/assets/downloads/k23269_Teflon_films.pdf

However, it is subject to significant mechanical creep.  Early wire wrap 
wire TFE insulation was known to "cut through" over time if routed too 
tightly against a wire wrap post.

Grant KZ1W

On 7/16/2017 7:43 AM, Jim Thomson wrote:
> Date: Sat, 15 Jul 2017 20:27:49 -0700
> From: Grant Saviers <grants2 at pacbell.net>
> To: "Roger (K8RI) on TT" <K8RI-on-TowerTalk at tm.net>,
> towertalk at contesting.com
> Subject: Re: [TowerTalk] Bearings for Axial Load
>
>
> <The spherical dual roller bearing described in the post that started the
> <thread is designed to accommodate significant shaft angular
> <misalignment.  That would occur when the tower leans in strong wind.
> <They are not intended to come apart and the preload/clearance is
> <established in the precise grinding of the parts.
> <Grant KZ1W
>
> ##  UST uses a peer brand bearing..at each end of the main drum, that allows for
> angular shaft misalignment.   On the drum, its all a radial load.  The peer bearingS, used by
> UST for the mast, are not of that type, and are not designed for angular shaft misalignment.
>
> ##  However, I have see the bearings, designed for angular shaft misalignment, used on masts.
> You can spot these types quickly, they resemble a normal  2 or 4 mounting hole pillow block bearing,
> but the hollow shaft in the middle, will....wobulate, and tilt a few degrees in any direction off the main axis.
>
> ##  I tried uhmw sheeting, .125 thick, for some hb  2 inch diam disc insulators on a 40m yagi a few yrs ago.  They were slid
> over the normal  solid insulator...and positioned dead center in the solid insulator.  The idea was to  increase the
> V breakdown of the solid insulator.   Works.... but the white UHMW  turned brittle after 1-2 years..and was very fragile.
> It was not UV resistant.   I have a lot of teflon on hand....is teflon UV resistant ??
>
> Jim   VE7RF
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