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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