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 <bi...@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
