[TowerTalk] Mechanic drawing for telescopic tower ( pulley / wires path ) ?

[Patrick Greenlee]

Rag, They say a picture is worth a thousand words. Not in this case. I 
can't get a good picture from the ground.

OK, the main thing is that the cable goes from the winch, outboard of 
all tower components and then around the pulley and connects to the 
inner tower section.  The cable from the winch to the pulley is outside 
of the tower up to the pulley.  The pulley transitions the cable from 
outside the outer tower section to inside the outer section (outside the 
inner section.)  The cable end opposite the winch terminates near the 
bottom of the inner (movable) tower section. The trick is to lead the 
cable fair (translation, not have any place where the cable drags across 
any part of the tower.)

The cable will be moving with respect to the outer tower section when 
the inner tower section is raised or lowered but is not moving with 
respect to the inner (raise/lower section.)  This relates to adjusting 
the position of the  pulley as it is better to have the cable contact 
the movable section somewhere along its run than to contact the outer 
section where is would wear out the paint or galvanize or just wear out 
the cable needlessly while grinding a path through an aluminum tower 
component..

You probably deduce from the above that the plane of the pulley is not 
parallel to the side of the tower.  It is "twisted" (cocked?) in order 
to get the cable from outside the fixed section to inside it. Some 
advice:  if in doubt get a better, stronger, and larger diameter 
pulley.  Other factors being equal a larger diameter pulley translates 
to longer life for the pulley and the cable.

Executive summary:  Cable goes from winch to the pulley on the outside 
of the fixed tower section and then over the pulley and down between the 
tower sections to near the bottom of the inner/movable section where it 
is terminated.

73,

Patrick NJ5G

On 5/19/2014 1:14 PM, Stein-Roar Brobakken[LJ3RE-LB3RE-K3RAG\(Contest 
LN5O-LA5O\)] ex : LA6FJA wrote:
> Hi
>
>   
>
> Do anyone have a mechanical drawing of telescopic tower either homemade with
> square tubes or like versa tower?
>
> ( The way wires goes throuh pulleys I what I am looking for ).
>
>   
>
> I just plan to make a easy tower for portable use, and my friend said they
> had heavy duty pulleys for wires at agriculture machine shop.
>
>   
>
> 73s LB3RE Rag
>
>   
>
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