Peter,
Thanks for sharing the PI4CC photos and info. Lots of good engineering.
I am also interested to see Grant's design of a radial top bearing with 4"
thick UHMW.
73, Rich, N6KT PJ4K
On Sunday, May 10, 2020, 07:45:17 AM PDT, Peter <pc2a@pi4cc.nl> wrote:
Rich,
Have look at https://www.pi4cc.nl/album/rotor%2040M/slides/07.html for
some ideas.
Here is a rotor bearing that carried all the load for a 2 el full size
40 meter beam
Have also a look at the rotor build and breakout rotor pipe if the
torque is too high for the rotor.
Yes the beam can spin free but it willsave a broken rotor :-)
https://www.pi4cc.nl/tech-info/ is also a nice source for our way to
explain "How do they do it?"
Peter
PC2A
Op 10-5-2020 om 16:18 schreef Richard Smith:
> Hi Grant,
> I am also interested in your concept of a UV resistant UHMW radial top
> bearing. I am part of a team that is building a station in the Caribbean, and
> am considering trying a non-metal bearing approach. Do you have a sketch or
> drawing that you might share?
> 73, Rich, N6KT PJ4K
> On Sunday, May 10, 2020, 06:01:51 AM PDT, Art Greenberg <art@artg.tv>
>wrote:
>
> > My choice is a UV resistant UHMW radial top bearings for low cost, no
>> maintenance, long life, and low friction. A 6x6x4" thick block ($47) is
>> what I made for the 3" mast radial bearing with 500# loading. In
>> perfect condition after 6 years.
> Grant,
>
> I'm curious about this. Some questions:
>
> - How did you drill the hole for the mast?
>
> - How much oversize? I imagine its not very critical, is that true?
>
> - Is any particular color better with respect to UV and other environmental
> exposures?
>
> Thanks, and 73.
>
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