Well, I would not necessarily use a thrust bearing to prevent steel on steel
from wearing. I think it would outlast me, in most cases . . .
Stan w7ni@teleport.com
mjirvine wrote:
> Why wouldn't you automatically put a bearing in.
> Metal on metal will always wear.
>
> At 08:15 PM 10/11/98 -0500, you wrote:
> >
> >On 10/11/98 20:58:59 you wrote:
> >>
> >>
> >>I had an aluminum mast up for several years in a Rohn 25 "snorkle"
> >>type top section. Upon removal, I found that the aluminum was heavily
> >>scored where it rubbed against the steel. The use of an aluminum
> >>mast would seem to dictate the use of a thrust bearing to prevent
> >>eventual failure of the mast. I don't think that using a bushing in
> >>the snorkle would be advisable because of the reduction in the mast
> >>diameter that could be accomodated.
> >>
> >>73, Roger
> >>
> >>
> >Yes!, I've noticed the same here. I use a 24 foot, 2"OD, 0.25" wall 6061
> T6 aluminum
> >mast for my VHF-UHF stack without a bearing or bushing at the top of the
> tower and a
> >concerning amount of the aluminum is missing where the mast rubs on the
> top plate. Of
> >course a bearing/bushing would probably help prevent this problem but with
> the recent
> >thread on aluminum vs. steel I gotta wonder if it would have occured with
> a steel mast.
> >73,
> >Ed K3DNE
> >
> >
> >
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