The purpose of a thrust bearing is to support the side loading on a
mast, so it does not reach the rotator, which is not designed for side
(or shear) loads.
Hope this helps.
Brian
KE6IYC
On Jun 2, 2009, at 5:17 PM, Al Williams wrote:
> I hope that some there will come a posting in simple terms about the
> purpose
> of a thrust bearing?
>
> It seems to me that the "axis of rotation" for a mast mounted thrust
> bearing
> is vertical, thus the design is to support
> loads around the mast that are not equalized?
>
> However an jet engine is rated in thrust which is in line with the
> motion of
> the air?
>
> These two are in conflict, whats wrong?
>
> k7puc
>
>
> --- Original Message -----
> From: "Mike" <nf4l_NO_SPAM@nf4l.com>
> To: "Brian Machesney" <nekvtster@gmail.com>
> Cc: <towertalk@contesting.com>
> Sent: Monday, June 01, 2009 3:41 PM
> Subject: Re: [TowerTalk] Purpose of Thrust Bearing
>
>
>> Brian Machesney wrote:
>>> I'm trying to clear up a point of my own confusion and/or ignorance
>>> w.r.t.
>>> "thrust bearings."
>>>
>>> I used to think that the "thrust" taken up by the bearing, e.g. when
>>> supporting an antenna mast, was a vertical force. I have read a
>>> lot on
>>> this
>>> reflector recently that contradicted that belief. In searching
>>> McMaster-Carr
>>> for a bearing to take a vertical load, I find that they describe a
>>> "thrust
>>> bearing" as being designed to, "Support loads parallel to their
>>> axis of
>>> rotation."
>>>
>>> This sure sounds to me like it's meant to support the weight of a
>>> mast
>>> and
>>> antennas - a vertical force when we mount a thrust bearing in the
>>> hole at
>>> the top of a tower or on an "accessory shelf."
>>>
>>> Which is it?
>>>
>>> 73 -- Brian -- K1LI
>> It's the McMaster-Carr definition.
>> Some people describe using two bearings, one above the other, to
>> prevent lateral forces from acting on a rotor (like a pry bar on a
>> fulcrum), but that's not the designed purpose.
>>
>> 73, Mike NF4L
>> _______________________________________________
>>
>>
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