Hello Geo
thanks very much and I would like to know other experiences
I have my setup same as you. 1 year ago I needed to remove a rotor and was
a pain, mast bend with the wind, broken my thrust bearing on top of the
tower
I thought that if i have another one between rotor and top of the tower,
this will help to align the mast when no rotor
73,
Jorge
CX6VM/CW5W
2016-12-09 12:51 GMT-03:00 George Dubovsky <n4ua.va@gmail.com>:
> Jorge,
>
> If this question is directed at me, no, I only use a bearing/bushing at
> the top of the tower. I generally have at least 10 feet of mast (~3m)
> inside the tower and I have always thought that the alignment issues with 2
> bearings and a rotator was not worth any perceived benefit.
>
> 73,
>
> geo - n4ua
>
> On Fri, Dec 9, 2016 at 10:25 AM, Jorge Diez - CX6VM <cx6vm.jorge@gmail.com
> > wrote:
>
>> HELLO
>>
>> Did you use one of this on top of the tower or another one inside tower,
>> between rotor and top of the tower?
>>
>> thanks,
>> Jorge
>>
>> 2016-12-09 12:10 GMT-03:00 George Dubovsky <n4ua.va@gmail.com>:
>>
>>> >I would expect either
>>> >tapered roller bearings, or today, do what most of industry does, and
>>> use
>>> >an engineering plastic bearing.
>>>
>>> And, in fact, that's what I do. One mast has a brass shaft collar that
>>> rides on a slab of Nylatron (GS grade I think), and the other mast uses a
>>> scrap TB-3 that was machined to replace the ball assembly with a Nylatron
>>> sleeve insert for axial and radial thrust. I expect both of them to
>>> outlive
>>> the towers they're sitting on... ;-).
>>>
>>> 73,
>>>
>>> geo - n4ua
>>>
>>>
>>> On Fri, Dec 9, 2016 at 9:14 AM, <charlie@thegallos.com> wrote:
>>>
>>> > > Looks really well made. I had the original Rohn counterpart for
>>> years
>>> > and
>>> > > it just kept on going.
>>> > > I added a zerk fitting so I could grease it. They last a very long
>>> time
>>> > > dry without lube, but I am anal
>>> > > about lubing everything hihi.
>>> > >
>>> > >
>>> > > Bob
>>> > > K6UJ
>>> >
>>> >
>>> > Looks nice, but one thing I just have not been able to understand for
>>> years
>>> >
>>> > Tower thrust bearings are a LOW rotation speed, high load application,
>>> > probably the WORST place to use ball bearings. I would expect either
>>> > tapered roller bearings, or today, do what most of industry does, and
>>> use
>>> > an engineering plastic bearing. I mean, we don't need a torlon bearing
>>> > there (the loads are NOT that high)
>>> >
>>> > I mean, a glass reinforced nylon, or a PTFE (Teflon) (say a 25% glass
>>> > filled or molly filled) isn't going to cold flow at ALL under loads a
>>> 2"
>>> > mast could sustain, will NEVER need lubrication, will never corrode etc
>>> >
>>> > You either get them molded for you (for some materials would be the
>>> > cheapest way - you do NOT want to know what torlon costs), or you
>>> slice it
>>> > from tube, or you even just use end on rods set around the
>>> circumference
>>> >
>>> > I mean, today they run the pivot bearings and lower boom bearing on
>>> cranes
>>> > in plastic bearings, because they hold up better than metals in those
>>> low
>>> > rotation speed, intermittent rotation applications
>>> >
>>> > _______________________________________________
>>> >
>>> >
>>> >
>>> > _______________________________________________
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>>> > TowerTalk@contesting.com
>>> > http://lists.contesting.com/mailman/listinfo/towertalk
>>> >
>>> _______________________________________________
>>>
>>>
>>>
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>>
>>
>>
>> --
>> 73,
>> Jorge
>> CX6VM/CW5W
>>
>
>
--
73,
Jorge
CX6VM/CW5W
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