On 7/20/2010 9:50 PM, Jim Thomson wrote:
> Ok... I'm not impressed with the F-12 method of securing the over head truss
> line to the 2" mast.
> The F-12 method consist of looping the 1/8" SS truss cable through the
> "U" portion of a standard
> U-clamp.. with the saddle on the back end of the mast. While this method
> works, it's an absolute
> bitch to get some tension on the truss line. IE: you have to push up on
> the U bolt.. and hold it there, then tighten
> the U bolt.
>
Insert a turnbuckle...Tighten as much as you can by hand and use the
turnbuckles in the Phillystran(one in each direction) to fine tune it.
I'd not fasten the turnbuckle to the upright as that contact point would
just be another source for noise.
I did the nearly 30' long 7L C3i 6-meter which has its own support for
the truss by setting it on sawhorses out towards the ends. After
tensioning the Phillystran I moved the saw horses back toward the middle
to check for sag. It's nice and straight. Thing is, if you put a pair
of small turnbuckles up there, any long term stretch can easily be
handled. OTOH I've never seen the stuff stretch enough to notice.
73
Roger (K8RI)
> Does anybody make a 2 x piece clamp that will clamp onto a 2" mast, such
> that a SS /galvanized small
> turnbuckle can be installed on either side of the 2" mast ??? That would
> make life a LOT easier. Of course,
> the one coninuous piece of stock truss line would have to be cut in the
> middle, and either cable clamps or nicropress crimps
> installed + a pair of thimbles, etc.
>
> I can envision the proposed 2 x piece wrap around clamp assy in my head.
> Plan B is... since I use several HB mast steps
> already, which use a single DX eng super mast clamp assy, I might be able
> to slide a thin piece of flat bar steel between
> the 2 x clamp halves... and drill it for a 3/8" hole. Then the G-8 bolt
> would pass through both halves of the mast clamps
> plus the flat bar in the middle. Once tight, there is a small gap between
> the 2 x halves of the DX eng clamps anyway.
> The flat bar would pivot down on an angle, and the other end of the flat bar
> could be used to terminate one
> end of a turnbuckle.
>
> What do other folks use to terminate an over head truss ?
>
> later...... Jim VE7RF
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