Date: Thu, 13 Aug 2015 15:47:44 +0000 (UTC)
From: Billy Cox <aa4nu@comcast.net>
To: Doug Renwick <ve5ra@sasktel.net>
Cc: George Dubovsky <n4ua.va@gmail.com>, Robert Harmon
<k6uj@pacbell.net>, towertalk <towertalk@contesting.com>, Jim Thomson
<jim.thom@telus.net>
Subject: Re: [TowerTalk] Shorty Forty Hose Clamp thread
Good Morning All,
Doug, once again you are not examining the total joint situation. We
will get to that in a moment as there are other variables to consider.
>From your past behavior, such as the "free climbing" discussion on this
same forum, you take the position you are 100% correct, and so therefore
everyone else is wrong. A review of the archives seems to confirm this.
## IMO, anybody who engages in free climbing is a complete idiot these days.
Get caught free climbing at any telco /cell-site, and you are punted off the
job site..asap. If WCB finds out about it, huge fines are levied.
## Now if you have a bunch of tic rings on a tower, its tougher to install a
safety steel cable from top to bottom of the tower.
## getting back to hose clamps, and also the use of counterbored tubing,
what else that works good is rivets on each side of the joint, like 3 on
north side, and 3 more on south side..180 degs apart. Or rivets every 120
degs .
On my F12, 80m rotary dipole, at the huge 2 inch OD swedge, the 3 x rivets were
already factory installed
on both halves, but one halve had all 3 x rivets loose. So I went nuts and
installed
rivets every 90 degs, 12 in all, end of problems. Rivets work good since
they suck from the
inside out. 3/16 rivets are a LOT stronger than 1/8. And 1/4 rivets are
stronger than 3/16.
## Optibeam uses metric tubing...so unless they swedge each ele joint, I can
see in that case, the
use of counter bored hole being used. Counter boring just 1 hole at each
joint is far more cost effective
vs swedging each joint. As far as .058 tubing, I have never seen a sloppy fit
yet when sliding
any two pieces together. Even using several different makes of tubing.
## 2 x machine screws, at right angles, when using snug fitting tubing, like
.058, and with nylocks,
is simple and super strong.
Jim VE7RF
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