If you read the info provided with PREFORMS / BIG GRIPS, you see that all
curved surfaces (inside thimbles and the curve side of shackles) should be
mated to flat /straight surfaces like: (equalizer plate bolts, the rod/pin
of a shackle.) See page three of this document. Here's the link:
Filename Big-Grip_DE-PLP_CommCatSec20 <dot> pdf
preformed.com/images/pdfs/Communications/Pole_Line_Hardware/Dead-ends__Accessories/Big-Grip_Dead-end/Big-Grip_DE-PLP_CommCatSec20.pdf
http://preformed.com/images/pdfs/Communications/Pole_Line_Hardware/Dead-ends__Accessories/Big-Grip_Dead-end/Big-Grip_DE-PLP_CommCatSec20.pdf
The only exception to this rule is you may use a curved shackle to a curved
shackle. This guide also suggests that you should not force a thimble into
the downward end of a torque bar, but use the pin/rod of a shackle.
Review the "arrangement" illustrations shown on page 4: Arrangement A
through G.
-Charlie N1RR
On Tue, May 22, 2018 at 7:56 PM, Steve Maki <lists@oakcom.org> wrote:
> Only if you use too-small thimbles. Properly sized thimbles for your
> properly installed big grip will be...just right! Big enough radius so it
> doesn't fall out, and strong enough to not compress from wire tension.
>
> BTW it's common to terminate a big grip (with thimble) to a pin shackle
> for attaching to guy weldments, etc. I usually use a shackle for coupling
> my non-conductive guy to the bottom EHS wire, just for a little extra
> flexibility.
>
> -Steve K8LX
>
> On 05/22/18 19:11 PM, Chuck Dietz wrote:
>
> The problem with using two back-to-back thimbles is the radius is too
>> small. It needs to “wrap around” something larger. Many thimbles would end
>> up squeezing together so that the guy grips would be out of specs by the
>> small radius. It would only be slightly better than guy grip to guy grip.
>> Also, when you need to take the guy loose, what will keep the thimbles from
>> coming out? If you really clamp down on the guy grip, it will be out of
>> specs. Maybe I am not acquainted with the type of thimbles you are talking
>> about. You would need to check the thimble specs.
>> Using the insulators keeps everything in spec, but they are heavy.
>>
>> Chuck W5PR
>>
>
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