[TowerTalk] Which Rohn thrust bearing to use

[Roger (K8RI) on TT]

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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-- 

73

Roger (K8RI)