[TowerTalk] Lifting a mast off the rotator

[Roger (K8RI) on TT]

I have a "pry bar" that the end will fit under the mast in my PST61,  
The pivot point is only a couple inches from the end while the bar is 
about 2' long, that gives me a 2: 22 multiple  (11:1 ), or 400#/11 = 36# 
on the lever to lift 400.  Using that in my system allows me to lift the 
mast about 1"
On my system when we installed the antennas, I simply used a u-bolt 
clamp, to serve as an anchor point on the mast for a come along.this 
lifted the mast with the antennas in place.  The mast was then clamped 
in place using a thrust bearing,  A 1" block was placed on top of the 
PST61, centered under the mast clamp the come along was hooked to the 
u-bolt mast clamp and used to lower the mast into the rotator mast clamp 
and onto that 1" block for spacing.

Possibly some of this may be of help giving you ideas.

73

Roger (K8RI)

On 4/24/2016 Sunday 10:11 PM, Les Kalmus wrote:
> I came home from Visalia to find my antenna system freewheeling. The 
> mast holds 4 yagis, one of which is very large, and is rotated by an 
> Orion rotator.
> If my suspicions are correct, the problem is the little 1/4" bolt 
> holding the shaft up into the bottom of the mast clamp has loosened 
> and allowed the shaft to fall.
>
> The tower is lowered and the antennas are tied off to a tree. I have 
> removed the mast clamp and now I have to raise the mast about 1/2" to 
> free the centering block so I can remove it to inspect that bolt.
> I have a come along with an additional block with which I can lift the 
> mast, but the carabiner I have won't fit into the small space between 
> the centering block and the inside of the mast.
>
> Any suggestions on a way to either hook the mast from the bottom or to 
> clamp to it so I can raise it? We're talking maybe 400 lbs in the 
> complete antenna system.
> I have done this in the past but I think I didn't have the centering 
> block at that time so it was easier to get something hooked into the 
> bottom of the shaft.
>
> Les W2LK
>
>
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-- 

73

Roger (K8RI)


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