With two thrust bearings it may be possible to build tension between the
bearings if both are clamped tight to the mast.
73, Roger (K8RI)
On 7/15/2017 Saturday 3:31 PM, Clay Autery wrote:
OK.... now that I own a 60 foot Heights Tower, I am VERY interested in
bearings for my mast...
Currently, it has a single Yaesu at the top (6 set screws; 2 x 3 setup
using load bars to spread the load) and the mast WAS resting in an Alpha
Spid RAK...
I've not settled on the exact rotator I want to use yet, but the Big RAK
is on the list.
But, I AM convinced I'd like to use two thrust bearings: one at top and
one somewhere in the middle, and if I could find a rotator that had a
pass-through, I'd support the REST of the weight on a bearing BELOW the
rotator. Ideally, at least in my mind (tending to over-engineer
everything), I would prefer that the rotator experienced ZERO thrust
load. More than I can hope for I'm sure, but that's the "ultimate goal".
I have a 24', 2" x 1/4" aluminum mast with nearly 16 foot internal to
the tower.
______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
On 7/15/2017 11:20 AM, Jim Thomson wrote:
Date: Sat, 15 Jul 2017 01:56:37 -0400
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Bearings for Axial Load
<Roller and ball bearings work well for side loads. Ball bearings in a
<horizontal race can support substantial loads. Roller ans ball bearings
<typically work in one axis at a tine. It takes a tapered bearing, like
<a wheel bearing to do well on both axes.
<73, Roger (K8RI)
## u sure about that ? A tapered bearing, like a wheel bearing, is designed
to be mounted horizontal. Mount it vertical, and all the load ends up on the
bottoms
of those shafts that go through the tapered bearings... on the now horz
section, that all those
vert shafts are connected to. . Im sure it was on your site that
depicted broken shafts..that go through the center of the tapered roller
bearing. IF the wheel bearing was
big enough to begin with, and 2 of them were used, it should not be an issue.
IF the rotor in question had
the entire weight of the mast + ants on it, then there would be no weight on
the bearings either... only
an axial load, when the wind blows.... moot point.
## I dont know what type of bearing the speer brand is..... thats used in the
UST crank-ups, but they are
built like a tank...and come with locking collars. I used 2 of em... + a K7NV
small PP.
Jim VE7RF.
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73
Roger (K8RI)
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