[TowerTalk] TB3 Thrust Bearing Binding

[Roger (K8RI) on TT]

On 7/30/2015 8:50 PM, john at kk9a.com wrote:
> Is there any rotator manufacture that recommends using two thrust bearings
> along with the bearing in the rotator?
>
> John KK9A
>
>
>
> To:	<towertalk at contesting.com>
> Subject:	[TowerTalk] TB3 Thrust Bearing Binding
> From:	"Kenneth Goodwin" <krgoodwin at comcast.net>
> Date:	Thu, 30 Jul 2015 16:17:32 -0500
>
> >From all indications with the outside temps reaching 100 degrees F, one or
> both of my two TB3 thrust bearings seems to be binding.  All TX2 Tailtwister
> rotator electrical data measured from the ground matches my baseline
> (resistance), I can hear and feel the brake release and the voltages applied
> to the TX2 motor windings are normal but until this morning when it got into
> the 80's - it wouldn't budge at all.  I use one thrust bearing on the top
> platform and a second as a means to remove the rotator if ever needed and
> keep the tangential loads off of the TX2 rotator.  I believe this happened
> the day before and it was in the same position (332 degrees).  Usually when
> the 40 meter beam fails to rotate, the TX2 brake mechanism is binding even
> with the Green Heron RT-21 rotation algorithm (small rotation the wrong way
> before rotation to the commanded setting).  Is heat a feasible failure
> mechanism for a Rohn TB3?   Anybody else ever run into this problem?  Ken
> K5RG
>
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-- 

73

Roger (K8RI)


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