[TowerTalk] Which Rohn thrust bearing to use

[K6UJ Bob Harmon]

Roger speaks the truth  :-)
Another comment, regardless of which grease you use, get up there with your
grease
gun and shoot some grease into the thrust bearing zerk fitting once a
year.  Along with
your other annual maintenance on the tower.

Bob
K6UJ

On Wed, Dec 7, 2016 at 12:37 AM, Roger (K8RI) on TT <
K8RI-on-TowerTalk at tm.net> wrote:

> 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)
>
>
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