[TowerTalk] Swinging gate, 3" thrust bearing

[Roger (K8RI)]

David J Windisch wrote:
> Yet another project that isn't going to happen.
>
> All-aluminum welded construction. 
>
> Fits 18"-face tower, eg, Rohn 45.  
>
> Gate swing is around 240 degrees.
>   
I've built several of these, one some 20 years ago. However I didn't get 
fancy with the construction.  They were built of pipe, pipe fittings, 
and tubular mast. The actual construction gave it rigidity.  Stuck out 
from the tower by 3' (give or take) . The thrust bearings were simple 
pipe T's with the threads reamed out. Overall they were 10'-20' tall so 
antennas could be stacked. The bearing distance from the tower was 
adjustable (the farther from the tower the more degrees of rotation 
available)  as was the length of the swing arms (at construction time)  
The swing arms were connected vertically with the masting at the pivot 
point where the rotator mounted at the bottom and again at the outer 
ends. It just formed a tall rectangle. I used one of them for nearly 15 
years.  I think the remnants are still on the pile behind the shop.

73

Roger (K8RI)

> One platform/shelf for rotator, one platform/shelf for thrust bearing holding top of gate.  Platforms are 3/16" thick trapezoids, 16-1/2" base-1, 7-1/2" altitude, 14-1/2" base-2.  Support arms are 1" x 2" x 24", 1/8" walls.
>
> Long gate side is 48", 2" od, 1/8" wall.  Short gate side is 27", 2" od, 1/8" wall.  Long-short spacing is 27" center-to-center.  Long and short sides are connected by 2" x 2" square tubes.
>
> 3" Unarco-Rohn brg included for top support of gate.
>
> I have some pictures.  Email me off-reflector: davidjw  _at-  cinci dot rr dot com
>
> You supply U-bolts and other hardware.
>
> I ship conus for $350 ono.
>
> Tks for reading.
>
> Brgds,
> Dave Windisch, W8FGX
> 513-674-7202 any time
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