[TowerTalk] PLP "Big Grips"

[Mac]

you know Wayne I left that important part out.  rather and or the size 
of the Thimble or Egg if used and the relationship to how the ends are 
mated to the actual cable and or if the thimble/egg make those ends lay 
less than desired in relation to the actual cable it is gripping,  very 
good point and experience you share.

Early in my 'guyed' days we tried to use a strain gage to determine the 
pull stress tautness of the guyed cable, never really got very good at 
using the tool and most typically just resorted to the finger and best 
guess tension test to determine the final setting of the turnbuckle.

Don't know what level of tightness guys find using to grip or pull on 
1/4" and example R-25 but my bet is 9400 pounds will break the weld from 
the leg of deform it at the least, all the while the cable grip held.

Might be of little consultation when your shinny new tower and antenna/s 
are laying in a heap on the ground. But my cable grip HELD !

mac/mc  w5mc

On 2/20/2019 11:36 AM, Wayne Kline wrote:
>
> Mac,
>
>   Not from the show me state BUT a skeptic  , in the 80’s when these 
> GUY GRIPS started creeping into the ham community ( my  limited 
> knowledge time wise)
>
> There were two different  ones  available  locally  for ¼  “ EHS ( 
> strand)    5 wire wrap  and a 6 wire  wrap.
>
> Having access to a QC lab in a truck manufacturing CO ( Mack Trucks) 
>  We set up an analisys with proper OD  HD thimbles and with out 
> thimbles ( Read1/2 “ Dai.  Pull point)
>
> With Rohn  1/4:”  EHS  with it’s 6000lb breaking strength.  IF memory 
> servs me the  EHS started to delamanat, elongqate and deform around 
> 9400 lb. pull .  The  Thimble also decreased it’s open end dimension. 
> At this point and above the strands of the cable started to elongatete 
> and shear   ( read , catastrophic failure was  not a big bang but a 
> strand by stran domino.
>
> The Head Mechanical Eng.  Predicted the thing PLP grip to fail before 
> the strand  WRONG.   He was really into it now. Hence his sugjestion 
> to removal of the thimble and just using the  pulling haws ½ dia. 
>   Pull pin  and saying  NOW the improper installing will cause a PLP 
> big grip failure  !
>
> Again the PLP line product  no mater 5 wire or 6 wire did not  fail.. 
> the Rohn ¼ EHS failed before the PLP  product did  every time  ( 
> there  were 6 full tests ) .
>
> This was tested  with only Rohn  ¼  strand wire and PLP 5 and 6 wire 
> Big  Grips
>
> Made a beleaver  out of me
>
> Wayne W3EA
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows 10
>
> ------------------------------------------------------------------------
> *From:* TowerTalk <towertalk-bounces at contesting.com> on behalf of Mac 
> <libbysales at austin.rr.com>
> *Sent:* Wednesday, February 20, 2019 12:02:04 PM
> *To:* towertalk at contesting.com
> *Subject:* Re: [TowerTalk] PLP "Big Grips"
> Just from the refraction of the material and then the feel it just near
> has to be some form of Silica, but best of all do they ever work well..
> I've never heard of a failure if even done half correct. When i first
> discovered these I was skeptical and reviewed with our head of Electric
> utility .. They swore by them and never a problem in long term use and
> maintenance free. And PLP is the father of these having led the way best
> i experience.
>
> mac/mc  w5mc
>
> On 2/20/2019 12:12 AM, Byron Tatum wrote:
> > Just out of curiosity--     I was wondering if anyone knew the exact 
> materials that are used to coat the inner surfaces of the PLP "Big 
> Grips" such as BG-2144 (1/4") or BG-2146 (5/16")? It appears to me 
> that a gritty material is in combination with an adhesive. I was 
> reading about the manufacturing process used to make a very similar 
> dead-end grip by a PLP competitor and it is mentioned the strands of 
> grip are dipped in an adhesive to bind them together, then they 
> mention the final application of the abrasive material to inner 
> surfaces. Just curious if anyone knew what the materials used were, 
> especially the abrasive/grit material. I recall seeing a gritty 
> material dropping out of older grips (of these exact two mentioned) 
> when taking apart older guy assemblies, plus seeing thin strips of 
> solidified adhesive coming off of the strands of grips. Was wondering 
> if the gritty material is a silica compound or something 
> else??Thanks, Byron W5FH
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