I notice that the G10 insulators I have made (wire insulators, turned or
cut on my crude home tools... I don't have a tower!) start out "G10 green"
but then turn brown after a few years in the weather. I suspect this is UV
although I cannot rule out cut fiber ends absorbing something (moisture?)
and then turning brown. It seems somewhat worse at the rough cuts I have
made than on the "shiny from factory" surfaces although both turn brown.
This browning never happens in indoor G10 applications.
Is this entirely cosmetic?
I really like G10 as a material in the workshop because it combines
toughness with being easy to work (especially the ability to punch holes in
thin sheets.)
I have also been using the red GPO3 Electrical Fiberglass in indoor HV
applications, it is a very nice material but wears the heck out of saws or
drills that are not carbide. I might try some outside.
Tim N3QE
On Fri, Dec 18, 2015 at 5:59 AM, Stan Stockton <wa5rtg@gmail.com> wrote:
> Those look identical to the ones I made for my 8m 4 Square Towers.
> Use G10, not just any fiberglass. The G10 rod is more like $20.00 per
> foot retail, unless you do a little searching. The one thing I would
> do differently is add a washer over the machined ends of the
> fiberglass insulators to put a flat against the unturned portion of
> the insulator instead of the sharp edges from the ends of the tower
> legs. Those sharp edges can splinter the fiberglass. Also if you
> span the joint with flat G10 material (maybe 4 inches wide by 18
> inches long by 3/8 inches thick) it will at least reduce if not
> eliminate the lateral movement.
>
> I have Fiberglas rod guying them now but for many years had four 70
> foot towers unguyed with this setup at the base.
>
> It is interesting that a lot of hams are let's say "thrifty" but when
> it comes to having something made or making it themselves to save
> hundreds or even thousands of dollars, many will pay whatever it takes
> to buy the end product.
>
> http://k5go.com/40-meters/
>
> 73...Stan, K5GO
>
>
>
>
>
> > On Dec 17, 2015, at 10:43 PM, Merv Schweigert <k9fd@flex.com> wrote:
> >
> > 20 mins work with a 5.00 fibre glass rod spun in a lathe,
> > sort of grossly overpriced exaggeration of a Rohn insulator.
> >
> >> I believe there is a slight misrepresentation here. I've never seen
> these in any Rohn catalog. Rather than
> >> calling them Rohn 25 tower insulators, I think they are better
> described as insulators for Rohn 25 tower.
> >>
> >> 73, Roger
> >>
> >>
> >>> On 12/17/2015 7:49 PM, w5jmw@towerfarm.net wrote:
> >>> ok,the station wanting the insulators for a rohn 25.there is a set
> available from ab5k.he is listing them on e-bay set of 3.look for dxer49 on
> e-bay.I believe they are new..73 john
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