Prime Bearing in L.A. at 213-375-4849 has good bearings at reasonable
prices. All the hams in my zip-code have purchased bearings with grease
zerks from them and are happy with quality and price. Both of us are
pleased and will buy from them again. The bearings we both bought are
mounted in very stout cast iron carriers with 4 mounting holes making it
easy to match drill holes to mount them, if not supplied.
My first bearing from them has bearing part number UCF210-31 and is 1
15/16 inches to fit a particular mast material. I will soon be ordering
a couple more for the 2 inch DOM mast for my SteppIR DB42 as I intend
to use two bearings to eliminate side loads on the rotator. I recommend
painting or otherwise inhibiting rust on any part of the bearing
assembly not painted and painting the painted part can't hurt.
I also recommend placing a water deflector as has been suggested on this
reflector previously. A rubber boot affixed to the mast and slipped
down next to the bearing offers pretty good protection, is cheap, and
easy to install (prior to installing the mast.) These "boots" are
available at the big box stores or plumbing supply houses and are
intended for waterproofing roof vent penetrations. There are other
methods using other materials that have been discussed here as well.
Patrick
On 6/8/2015 7:10 AM, john@kk9a.com wrote:
If they are made like the TB3, I would avoid it. I bought a TB3 for my
Aruba station and the brand new one was difficult to turn. I returned it
and received a replacement which was better. After a year of use it was
rough turning. I am sure that some grease would have helped but you are
not supposed to grease them. I replaced it with another brand attached
with a homebrew mounting plate.
John KK9A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Looking for a TB4 bearing - need not be pretty
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 07 Jun 2015 23:53:06 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Hi Bart,
Lets see...Feel like a washboard gravel road. I had two and they felt that
way to me when new. They definitely do not feel like you expect a bearing
of that price to feel. They've since picked up a bit of wear. Wear as in
the top section sets down on the base real tight and the inside of the
bottom race is now like a razor. IOW, they are shot!
There are much better bearings with 2 and 4 hole mounts for a half to a
third (or less) cost, complete with zerk(s) There are those using
centering bolts, or the off center locking collar. They are available in
SS as well for a bit more money.
Try bearings.com or something similar. I can't find the original links
73
Roger (K8RI)
On 6/7/2015 9:17 PM, Bart Jahnke wrote:
All,
I am looking for a Rohn TB4 bearing.
New - would be nice - NOS okay too...
Used - be nice if it came with hardware... Need not be a beauty queen...
But prefer it not feel like a washboard gravel road when you turn it.
Anyone have anything on the shelf collecting dust, before I go to Ebay...
Thanks and 73
Bart W9JJ
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