[TowerTalk] Re: TowerTalk Digest, Vol 12, Issue 9

[Robin Midgett <robin.midgett@vanderbilt.edu>]

Shaft collars work very well as well; search www.mcmaster.com or 
www.grainger.com .


At 08:05 AM 12/2/2003, you wrote:
> Barry:
>
>      Before you loosen the rotator u-bolts, consider adding a clamp above 
> the top bearing.  I wouldn't rely on the two set secrews in the TB-3 to 
> support the vertical load of the mast and antennas while you're fiddling 
> with the rotator.  You can also add the angle and two u-bolts as Don 
> suggests to keep the antennas and mast from rotating.
>
> On my tower I have mast clamps that I made out of two face-to-face muffler 
> clamps.  Insted of the u-bolt that came with each, I used two long 
> carriage bolts (all-thread will work also) to hold them together around 
> the mast.  One set of clamps I have setting on top of the top bearing; I 
> don't rely on the bearing's set-screws for weight support.  I have a 
> second set on the mast about an inch above the middle shelf.  When I have 
> to remove the rotator, I'll lower this second clamp onto the shelf and 
> tighten it.  This way I'll have two fairly heavy clamps that support the 
> vertical load of the mast and antennas while the bottom support (rotator) 
> is missing.
>
> You'll probably have to cut or grind a bit off the facing ends of the 
> clamps' saddles so they can fit around the mast without hitting each 
> other. Also, consider getting clamps one size smaller than the OD of your 
> mast. For my two inch mast I bought inch and seven-eighths clamps.
>
> GL es be safe de
> Gene Smar  AD3F

Thanks,
Robin 

_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk