I have been running a side-mount for ~10 years that uses a piece cut out
of a household cutting board as a centering (not thrust) bearing. It
shows essentially zero wear - remember, we're talking ~1 RPM here.
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
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On 5/18/2010 4:18 PM, Charlie Gallo wrote:
> On 5/18/2010 Grant Saviers wrote:
>
> ...snip...
>
>
>> I'm thinking that plastic sleeve bearings might be the answer for
>> handling the lateral mast force. Teflon /Rulon/Torlon are obvious
>> choices if cost is no object. UHMW (ultra high molecular weight)
>> polyethylene is a cheap very slippery plastic used for sliding bearings
>> and low speed rotating bearings. It's cheap but can't handle much UV,
>> so will need covering up from sunlight. ...snip...
>>
> Another problem with UMHW is that it cold flows, which is why I was saying a
> thrust bearing made if one of the glass reinforced self lubricating plastics
> (say a glass reinforced teflon - of course pure teflon cold flows too)
>
> I wonder of a coating of say Molgice would be perfect. As you said,
> something like Rulon 142 would probably be perfect (for that matter Torlon)
>
> I can't see it being THAT expensive - the real cost on say Torlon would be in
> the making of the mold - run off a bunch or rings the right size so that you
> don't end up with 90% of the material on the floor
>
>
>
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