A couple of stainless steel hose clamps (one placed above the pointy
top tube and one below) and overlapping the top and bottom edges of the
bearing sheet respectively will keep it (whatever the material
chosen) in place.
Of course, how many rotations of the antenna would it take to reduce
the strength of the unprotected aluminum mast significantly (say to the
90% level)? I am thinking that would be a serious rotator workout!
73 de Mike, W4EF......................................
----- Original Message -----
From: "Don Havlicek" <n8de@thepoint.net>
To: "Jim Lux" <jimlux@earthlink.net>
Cc: "(Reflector) TowerTalk" <towertalk@contesting.com>
Sent: Monday, April 07, 2003 8:19 PM
Subject: Re: [TowerTalk] Above the Thrust Bearing
> Jim,
> He wants something to fit INSIDE that collar.
> UHMW sheet isn't flexible enough for that task.
> The Teflon sheet [about 3-4 mil] will be perfect for his task, and
> require NO machining.
> Don
> N8DE
>
> Jim Lux wrote:
> > Don't bother with Teflon... use High density (UHMW) polyethylene cutting
> > boards... Less than $10 at your local discount store.. Very good
dielectric
> > properties, easy to cut (make sure that saw is SHARP), and almost as low
a
> > friction coefficient as PTFE.
> > Unless you were planning to heat your antenna up hot enough where the PE
> > starts to flow....?
> >
> > ----- Original Message -----
> > From: "Don Havlicek" <n8de@thepoint.net>
> > To: "Jerry K3BZ" <k3bz@arrl.net>
> > Cc: "(Reflector) TowerTalk" <towertalk@contesting.com>
> > Sent: Monday, April 07, 2003 6:17 PM
> > Subject: Re: [TowerTalk] Above the Thrust Bearing
> >
> >
> >
> >>Jerry,
> >>Get some Teflon sheet and cut a piece to fit. Should last a lifetime.
> >>Don
> >>N8DE
> >>
> >>Jerry K3BZ wrote:
> >>
> >>>I've received several good comments and ideas, thanks. What I'm really
> >>>concerned about is the aluminum mast and the aluminum tower sleeve
> >>
> > wearing
> >
> >>>away slowly from metal-to-metal contact. But grease isn't the only way
> >>
> > to
> >
> >>>keep them from actually touching. What about some sort of "bushing" to
> >>
> > fit
> >
> >>>between the mast and the sleeve?
> >>>
> >>>I was thinking of a section of thin-wall pvc of appropriate diameter
and
> >>>wall thickness, sliced length-wise and inserted betwen the mast and
> >>
> > sleeve
> >
> >>>on opposite sides of the mast, then clamped to the mast above and below
> >>
> > the
> >
> >>>sleeve. The idea would be for the pvc to be sacrificed and replaced
> >>
> > every
> >
> >>>few years as necessary. I'm no engineer and I don't even play one on
TV,
> >>
> > so
> >
> >>>any comments from those more talented than I?
> >>>Jerry K3BZ
> >>>
> >>>
> >>>
> >>>_______________________________________________
> >>>
> >>>See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
> >>
> > Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
any
> > questions and ask for Sherman, W2FLA.
> >
> >>>_______________________________________________
> >>>TowerTalk mailing list
> >>>TowerTalk@contesting.com
> >>>http://lists.contesting.com/mailman/listinfo/towertalk
> >>>
> >>
> >>
> >>_______________________________________________
> >>
> >>See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
> >
> > Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
any
> > questions and ask for Sherman, W2FLA.
> >
> >>_______________________________________________
> >>TowerTalk mailing list
> >>TowerTalk@contesting.com
> >>http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
> >
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
|