It's all the way through. Not countersunk but counter bored. Head of socket
head screw is cleared to bottom out on OD of inner tube. OD of inner tube is
pinched very securely to ID of outer tubing.
Stan
Sent from Stan's IPhone
> On Aug 13, 2015, at 9:20 AM, Jim Thomson <jim.thom@telus.net> wrote:
>
> ## I understand counter bore.... but how can you do a counter bore, when the
> tubing thickness is paper thin to begin with... like .058 wall etc?
>
> Jim VE7RF
>
>
> -----Original Message----- From: Stan Stockton
> Sent: Thursday, August 13, 2015 6:53 AM
> To: Jim Thomson
> Cc: <towertalk@contesting.com>
> Subject: Re: [TowerTalk] Shorty Forty Hose Clamp thread
>
> After about 40 years of making my own antennas I learned something a few
> years ago when faced with assembling 65 tribanders (520 elements) we made for
> WRTC2014.
>
> I was introduced to the element joint attachment method I am told is used by
> Optibeam. I was skeptical when I heard the verbal description, having
> settled on pop rivets after every other conceivable method about 20 years ago.
>
> I made one element with pop rivets and another with a single stainless steel
> socket head cap screw with a counterbore (head clearance on socket head
> screw) for one wall of the larger diameter tubing for each joint, then
> grabbed each one in the center and violently shook them back and forth. The
> one with SHCS joints felt like one solid piece of tubing as compared to the
> pop riveted one.
>
> It is so easy and so solid, I will never mess with pop rivets again.
>
> A V block fixture with stops, drill press and some of these bits along with
> straight bits for the smaller diameter tube drilling are all that is needed.
>
> http://www.wttool.com/index/page/category/category_id/14686/
>
> make the job easy in comparison to many methods. The counterbore is
> important. Use stainless nylock nuts.
>
> YMMV but I'm sold on it.
>
> 73...Stan, K5GO
>
> Sent from Stan's IPhone
>
>
>
>> On Aug 13, 2015, at 7:42 AM, Jim Thomson <jim.thom@telus.net> wrote:
>>
>> The rest of the yagi should be using 3 x rivets
>> at each joint.
>>
>> Jim VE7RF
>
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