[TowerTalk] turnbuckle safety wires

[Roger (K8RI) on TT]

It depends on the wire (size, length, composition, and the tension. I 
used to regularly climb a 200' commercial tower that had 1" wire rope 
for guys. there was an 18" tall, guy attachment point (don't remember 
the height)  Those guys would ring like a tuning fork when struck with 
with a metal tool. it was way above 440
Hz.  That kind of vibration will unscrew a lot of hardware, but not with 
that kind of tension. The tower was a very solid 2' on a side in 20' 
sections, down onto an elevated pier pin base. The elevated base was a 
good 6' on a side. The pier pin was about 7' to 8' above ground. I have 
no idea as to how deep the concrete went.

Turnbuckles on 1" guys are BIG!

73, Roger (K8RI)

On 9/22/2017 Friday 8:04 PM, Steve Maki wrote:
> On 9/22/2017 19:36 PM, Grant Saviers wrote:
>> At the specified torque values for structural bolts, the fastener is 
>> far less likely to loosen. That isn't the static load in a turnbuckle 
>> which is exposed to many of the conditions that cause common 
>> fasteners to loosen.
>
> You would think so. But guy wires (and turnbuckles) seem to be under a 
> different dynamic situation than nuts and bolts in a motor for 
> example. Vibrations are relatively slow, and tension never nears zero 
> in a system with proper pre-tension. I think.
>
> -Steve K8LX
>
>
>
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-- 

73

Roger (K8RI)


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