We sailors would wrap a line twice around the eye and then leave a longer tail
and clamp that with some space between each clamp. The increased friction of 2
wraps around an eye/block/winch substantially reduces the pull on a knot,
cleats or (in this case) clamps. It could be that the phillystran needs to be
wrapped around something with a larger radius than the eye however… not sure of
the engineering on that point. So you might need a “thimble” in the set up.
On Jan 14, 2014, at 10:04 AM, Bill Wichers <billw@waveform.net> wrote:
> The bar idea would probably significantly reduce the allowable tension on the
> cable, similar to what knotting does, due to the force at each "bite point"
> weakening the cable. I suppose if the cable was sufficiently oversized this
> wouldn't pose a problem, but I'd certainly expect such a clamping method to
> effectively reduce the allowable tension significantly below the normal rated
> load.
>
> I'm actually a little surprised a dead end / preform isn't supposed to be
> used with the straight-strand version of the cable. Those grips work by
> compression of the cable they are "grabbing", and it's a fairly even pressure
> over the length of the gripped area. If one could be found that was the
> correct diameter for the cable being used it might be worth a shot, but I
> completely agree with Tom -- TEST ANYTHING YOU TRY BEFORE USING IT FOR REAL!
> He's also correct that dynamic loading is much worse than static loading.
> Wind causes vibration in towers and guys and that can cause your clamps to
> loosen over time, especially if they were marginal to begin with.
>
> -Bill
>
>
>> Has anyone thought of a long rectangular bar with multiple champhered
>> holes, with the Phillystran woven through from side-to-side? With enough
>> weaves, this should self-tension with just a single clamp on the far end.
>> Regardless, I would test pull and see what breaks first at what tension.
>>
>> 73 Tom
>>
>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|