[TowerTalk] aluminum tubing strength with holes.

[Joe Subich, W4TV]

David,

They make them in 2.75" to 0.625" tubing sizes.  You want 7/8"?
    http://www.dxengineering.com/parts/dxe-ecls-087

The entire list is here:
<http://www.dxengineering.com/search/department/clamps-and-fasteners/product-line/dx-engineering-element-clamps/welded-stud/yes?autoview=SKU>

73,

    ... Joe, W4TV


On 6/9/2013 7:07 AM, K1TTT wrote:
> They are made for much bigger tubing, I doubt they would tighten around 7/8” stuff.  My updated design is on my blog at http://wiki.k1ttt.net/2013%20Maintenance%20and%20Upgrade%20Blog.ashx?NoRedirect=1#bottom
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> David Robbins K1TTT
> e-mail: mailto:k1ttt at arrl.net
> web: http://wiki.k1ttt.net <http://wiki.k1ttt.net/>
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net <telnet://k1ttt.net/>
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> From: Jim W7RY [mailto:w7ry at centurytel.net]
> Sent: Sunday, June 09, 2013 01:52
> To: K1TTT; reflector -tower; antennas at qth.net
> Subject: Re: [TowerTalk] aluminum tubing strength with holes.
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> Why not use something like this?
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> http://www.dxengineering.com/parts/dxe-ecls-225
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> 73
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> Jim W7RY
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> -----Original Message-----
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> From: K1TTT
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> Sent: Saturday, June 08, 2013 5:53 AM
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> To: reflector -tower ; antennas at qth.net
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> Subject: [TowerTalk] aluminum tubing strength with holes.
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> I am assembling 5 of the 5 element 10m longjohns… I just got the first one
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> to the point that I put on the beta match and am not thrilled at the clamp
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> arrangement on the element.  On these the driven element is split, the butt
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> end of it goes into a plastic insulator about 2” long that is then clamped
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> in the boom-element clamshell thingy.  In their design an aluminum ring goes
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> around the element and is clamped with a #10 machine screw that also holds
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> the end of the rod and coax eye lug.  I am considering replacing that ring
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> with a #10 bolt through the element.  My concern is that the hole will be at
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> the point of highest stress for the driven element.
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> My question is this.  What is the relative strength of an undrilled 7/8”
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> tube vs a 7/8” with ¾” piece inside it with a hole for a #10 bolt through
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> them.
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> David Robbins K1TTT
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> e-mail:  <mailto:k1ttt at arrl.net> mailto:k1ttt at arrl.net
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> web:  <http://wiki.k1ttt.net/> http://wiki.k1ttt.net
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> AR-Cluster node: 145.69MHz or  <telnet://k1ttt.net/> telnet://k1ttt.net
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