Date: Sat, 15 Jul 2017 20:27:49 -0700
From: Grant Saviers <grants2@pacbell.net>
To: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>,
towertalk@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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