They work in a similar way as a screw/nut, friction.
Once they are installed friction prevent they from coming lose. The harder the
pull the harder the grip pulls itself around the cable. Friction prevents it
from unwinding itself as it grips around the cable.
I noticed, when I installed my grips that you only need two or three turns in
place to stop the guy wire from slipping. I have no doubts that when the rest
was wound up around the cable it would never slip off.
Hans - N2JFS
-----Original Message-----
From: Patrick Greenlee <patrick_g@windstream.net>
To: towertalk <towertalk@contesting.com>
Sent: Thu, Jan 7, 2016 3:22 pm
Subject: Re: [TowerTalk] My first introduction to guy-wire dead end grips
Unfortunately I don't know how they work, just that they do work and
very well in deed. I would guess it is some mechanical process similar
to Chinese finger cuffs or the wire pulling thingies similar thereunto
but I'm not a Mechanical Engineer. I have a good friend who has a MS in
Mechanical Engineering from UCLA plus over 35 years of hands on
experience who helped me install them on a 4-way guyed tower. I have
made him Bcc on this email and hopefully he will enlighten me so I can
pass it on. A lot of them in service and I have never heard of one
loosing its grip. Anyone ever know about one loosing its grip?
Patrick NJ5G
On 1/7/2016 12:49 PM, dw wrote:
> I'm trying to understand the use of pre-formed wire-wrap dead-ends for
> guy-wires.
> If I understand the install process, the guy-wire itself doesn't wrap
> around the lower anchor fixture.
> But the dead-end goes into the lower anchor fixture and the dead-end
> then wraps around the guy-wire.
> First the guy-wire tension is pulled up to pre-tensioned position.
> Then the dead-end is fed through the anchor fixture.
> Then one leg of the dead-end is wrapped around the guy-wire...either
> wrapped all the way or part way.
> Then the other leg of the dead-end is wrapped.
> And then the wrapping is complete....I think that approximates the
> installation steps.
>
> The question I have is, what is supposed to keep that wrapped dead-end
> from slipping off the guy-wire?
> Hard for me to believe it will grip the guy-wire just being wrapped
> around it, especially when the guy wire is fully tensioned.
> Why not put forged guy-wire clamps around the dead-end after its wrapped
> to ensure it won't slip off the guy-wire?
> What am I missing?
>
> Also, companies like Hubbell and AED manufacture straight-type bolt-on
> clamps that come in different lengths....like 6 inches with 3 bolts.
> How does the bolt-on clamp assembly compare to the dead-end, in terms of
> reliability and pull strength?
> Thanks!
> N1BBR :-]
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