If you're going to use wood then try and get hold of a block of Lignum
Vitae it it=92s a very hard, very dense self lubricating wood and in =
times
gone by was used in bearings =96 including the first chronometer!
=20
Bob Harrison / VE6BRH
=20
=20
-----Original Message-----
From: towertalk-admin@contesting.com
[mailto:towertalk-admin@contesting.com] On Behalf Of Sylvan Katz
Sent: Tuesday, September 17, 2002 11:37 AM
To: Zivney, Terry L.; towertalk@contesting.com
Subject: Re: [Towertalk] Wood Mast Bearing
=20
Terry
=20
> The mast is 2.5" OD. If I use a 2.5" hole saw to
> cut a hole in a board, will the wood swell and bind
=20
My rotator is situated at the base of my tower. I use wooden mast
bearing as
guides for the drive tube that extends from the base of the tower up to
the
mast that passes through a sealed metal bearing about 6' from the top of
the
tower and then through the thrust bearing at the top of the tower.
=20
If you use wooden bearing then it might be a good idea to immerse them
in
paraffin wax heated to a temperature that drives water out of the
wooden. I
treated each bearing for at least 30 mins this way. You can see the
bubbles
of moisture exiting the wood when the paraffin temperature is hot
enough.
=20
DO NOT attempt to do this on the stove or indoors. Paraffin is highly
flammable. I used a camp stove on the patio.
=20
Treating wooden bearing with paraffin has some advantages. It preserves
the
wood. It reduces swelling. And it provides a bit of lubrication.
=20
I will leave it to others to specify the proper diameter - I did not
need a
tight fit since I was only using my wooden bearings are guides and not
bearing in the true sense of the word. However, I understand that some
old
farm machinery used wooden bearings.
=20
** Standard liability disclaimer - I am not an expert only an amateur
sharing my experiences ***
=20
.. sylvan
=20
=D4=BF=D4=AC
----------------
Sylvan Katz, VE5ZX
Saskatoon, SK
"A Novel Perspective of Amateur Radio Contesting" at
http://www.dynamicforesight.com/~ve5zx
=20
=20
=20
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