[TowerTalk] Which Rohn thrust bearing to use

[Julio Peralta]

You know something comes to mind, I think I remember the UST bearing was 2
and 1/16". Could that be right?

Julio

-----Original Message-----
From: Hardy Landskov [mailto:n7rt at cox.net] 
Sent: Wednesday, December 07, 2016 8:57 AM
To: 'Julio Peralta'; 'Roger (K8RI) on TT'; towertalk at contesting.com
Subject: RE: [TowerTalk] Which Rohn thrust bearing to use

Yes they are made in China which is a plus because I had to have a friend
bore out about .005" so my DOM mast would slide in. The bolt pattern fit my
Rohn top plate. Life is good HiHi
N7RT/4

-----Original Message-----
From: Julio Peralta [mailto:jperalta4 at verizon.net]
Sent: Wednesday, December 07, 2016 8:29 AM
To: 'Hardy Landskov'; 'Roger (K8RI) on TT'; towertalk at contesting.com
Subject: RE: [TowerTalk] Which Rohn thrust bearing to use

Wow the 2 bolt 2" bearings look exactly like the ones UST sells for over
$180. They are probably made in China but since they aren't running at any
speed I would think they would be a cost effect replacement for the UST
bearing. Just need to make sure the bolt pattern is the same.

Julio, W4HY

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Hardy
Landskov
Sent: Wednesday, December 07, 2016 8:06 AM
To: 'Roger (K8RI) on TT'; towertalk at contesting.com
Subject: Re: [TowerTalk] Which Rohn thrust bearing to use

Surplus Center in Lincoln, NE has nice 4 bolt and 2 bolt flange bearings. I
bought a 2" 4 bolt for about $24. Their 3" is $56. Google and see their
website.
N7RT/4

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Roger
(K8RI) on TT
Sent: Wednesday, December 07, 2016 3:37 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Which Rohn thrust bearing to use

Try wheel bearing grease or  the white Lithium grease, or BR-2 a Beryllium
dioxide grease.  Wear latex or vinyl gloves.  It's difficult to get off
skin. Get it on your hands and it'l migrate all over your body.

73,

Roger (K8RI)


On 12/6/2016 8:30 PM, Grant Saviers wrote:
> The DXE thrust bearing looks like a well thought out design. See the 
> cross section picture.   Good WX protection.  Fairly robust casting 
> sections (my TB3 split).  The ball races are 45 degree angular contact 
> which makes the bearing equally capable in thrust and radial loads.
> That is not so in the TB series IIRC.  The DXE Summit Racing MechEng 
> heritage shows.
>
> The only thing I would like to see added are a couple of opposing 
> grease fittings (and a 3" mast version).  For most greases, the oil
> evaporates after 5 years and just leaves the carrier.   DXE 
> might/should use a fully synthetic grease with anti-fretting additives 
> which will last longer but not as long as many tower bearings are left 
> in service.
>
> Grant KZ1W
>
> On 12/6/2016 5:44 AM, Jim Thomson wrote:
>> Date: Mon, 5 Dec 2016 15:56:27 -0500
>> From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk at tm.net>
>> To: towertalk at contesting.com
>> Subject: Re: [TowerTalk] Which Rohn thrust bearing to use
>>
>> The Fafnir and many others including imports are far better than the
>> TB3 and 4.
>>
>> 73
>>
>> Roger (K8RI)
>>
>> ### Anything is better than a TB3 or TB4.   UST uses PEER brand
>> thrust bearings for both the big drum, and the mast.  The ones used 
>> on the
>> mast are NOT designed to self align.   The thrust bearings on the big
>> drum ARE designed to self align.  They come with a locking collar, 
>> that has a couple of holes, spaced 180 deg apart, on the top portion 
>> of the locking collar.  Just rotate the locking collar CW a bit and 
>> it binds tight, then use a drift punch  in one of the 2 x holes, and 
>> give it a gentle smack. Then the locking collar wont budge.  Locking 
>> collar also comes with a set screw.
>> Replace it with a SS type, then slop some never seize onto the 
>> threads of both the SS set screw and also the threads of the collar.
>>
>> ##  The TB3 /4 although popular, are not cost effective, not for what 
>> you are getting.
>>
>> Jim   VE7RF
>>
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>>
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>
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-- 

73

Roger (K8RI)


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