[TowerTalk] TB3 Thrust Bearing

[Bruce Ferratt]

Jon-
Hello.
I purchased the TB-3 because the Yaesu GM-050 bearing didn't mount on to the 
Rohn AS25G plate. It wasn't even close! Believe it or not I think I might be 
overkilling the entire project.  This is a 60ft tower, bracketed to my house 
at 20'.  I will be guying it.  I used 52 bags of 60lbs concrete at 4ft deep 
X  28" X 28".
The bracket is installed through the siding with carriage bolts and secured 
inside a room with a pressurized 2 X 6 board.  The bracket is bolted into a 
footing and the other three carriage bolts for the bracket go between 3 
studs inside the room.  I don't think it is going anywhere once it is guyed.
The tower has the 9ft top section with the peak.  Will be using an aluminum 
mast 1 1/4" OD with Yaesu G-450A rotor.  Beam is a Mosely TA-33M and stacked 
2m/440 vertical.

Any recommendations would be great but the concrete is already poured and 
bracket is installed.  Am waiting for better weather to start stacking tower 
sections.

Thanks
73
Bruce
K4BOF


>From: Jon Zaimes AA1K <jz73 at verizon.net>
>To: uglyatc at msn.com
>Subject: re:  [TowerTalk] TB3 Thrust Bearing
>Date: Wed, 15 Mar 2006 11:15:40 -0500
>
>Bruce,
>
>If the original bolts are not long enough to tighten down on a 1 1/4 inch 
>mast, you could replace them with longer bolts that would do so.
>
>But the TB-3 is a bit of overkill for that small a mast. A 2 x 4 block of 
>treated wood drilled slightly larger than the mast would be sufficient. In 
>fact Rohn used to sell such a block of wood (I think it was oak or cedar 
>rather than treated) with a hole for a 2-inch mast.
>
>73/Jon AA1K
>