[Towertalk] 620/340

[Barry]

On 14 Apr 2002 K7LXC@aol.com wrote:

> In a message dated 4/14/02 6:03:16 AM Pacific Daylight Time, na4m@arrl.net 
> writes:
> 
> > >     As far as the potential mechanical problems, double or triple-row the
> >  >rivets per joint and they won't come apart. Make sure the element
> >  >boom-to-element brackets are backed up with thru-bolts. And pay the extra 
> > 10%
> >  >for the upgraded 100 MPH version.
> >  
> >  Instead of double/triple-rowing the joint rivets why not use a couple of 
> >  small stainless screws/bolts with appropriate lock washers and nuts or 
> >  nylock nuts?     As matter of fact if there is a need to double/triple-row 
> >  the rivets to prevent potential mechanical problems maybe rivets are not 
> >  the best way to secure the joints - just use screws/bolts?   I know there 
> >  are  many cases where pop-rivets are working just fine but to me they've 
> >  always seemed kind of a dubious method to make secure reliable long-lived 
> >  mechanical joints.
> 
>     The problem is that with the existing aluminum tolerances, there is 
> enough room for the inner element piece to work against the rivets with the 
> help of the wind. By putting in another off-setting row of rivets (or two), 
> you remove the slop in the element joint and eliminate that problem. 
> 
>     The rivets aren't popping on their own so replacing them with another 
> kind of fastener doesn't really accomplish anything. 
> 
> Cheers,
> Steve     K7LXC
> TOWER TECH -
> Professional tower services for industry and amateurs

What happened to "do what the manufacturer says?" :.)
Barry--
Barry Kutner, W2UP              Internet: w2up@mindspring.com
Newtown, PA                     Frankford Radio Club