[TowerTalk] PLP "Big Grips"

[Wayne Kline]

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



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________________________________
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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