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Re: [TowerTalk] Yet another worm gear box failure...

To: dino@kx6d.com
Subject: Re: [TowerTalk] Yet another worm gear box failure...
From: k2qmf@juno.com
Date: Sun, 14 Oct 2012 11:28:52 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Hello Dino,

I wonder if you could post those pictures here so we can see them as
well??

I have two crank up towers and I am very concerned regarding that type
of failure!!

Many Thanks in Advance.

73,
Ted  K2QMF
 
On Sat, 13 Oct 2012 16:45:27 -0700 "Dino Darling" <dino@kx6d.com> writes:
> I do have some photos of K6CF's failure and it is exactly as Skip
> mentioned. I'll get those to you. However, I don't think there is 
> any
> real close-ups of the shaft. But you can CLEARLY see what broke!
> 
> Skip, thanks for the clarification on Mike's failure being the 
> shaft. I
> should have made that more clear in my first message. Again, this is 
> the
> failure K6CF had too...same place also! Chris' tower used to belong 
> to
> Jim Rafferty, N6RJ (SK). Jim would have purchased only the best at 
> the
> time.
> 
> As for the shaft failure; its unfortunate that they did not support 
> the
> shaft on BOTH ends of the multigroove pully! I was going to mention
> blocking the first two sections together and taking that stress off 
> of
> pulleys when not in use. US Tower does this on their military tower
> trailers and I've seen them on their towers sold to the Cell Phone
> companies. However, every failure has happened during transit that 
> I'm
> aware of. Block it as you go if you are worried about it!
> 
> If it was me, I'd modify the original 1" shaft models or replace it 
> with
> a newer system. I think the modification would be easy enough 
> though.
> 
> Dino - KX6D
>  
>  
> -------- Original Message --------
> Subject: RE: [TowerTalk] Yet another worm gear box failure...
> From: "Scott MacKenzie" <kb0fhp@verizon.net>
> Date: Sat, October 13, 2012 10:46 am
> To: <KJ6Y@aol.com>, <dino@kx6d.com>, <towertalk@contesting.com>
> 
> 
> Any one have any quality photographs of the shaft failure? I am 
> looking
> at
> photographs of the fracture surface. That should tell us the 
> mechanism
> of
> failure.
> 
> Scott 
> 
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf 
> Of
> KJ6Y@aol.com
> Sent: Saturday, October 13, 2012 1:37 PM
> To: dino@kx6d.com; towertalk@contesting.com
> Subject: Re: [TowerTalk] Yet another worm gear box failure...
> 
> Mike's tower sounds like the shaft broke and not a gearbox failure. 
> On 
> the older MD-750 motor drives, the shaft was 1 inch coming out of 
> the
> gearbox. (Tristao and then US Tower). US Tower then went to a 
> larger
> shaft, 1 1/4 or 1 1/2, don't remember which. Have not seen any of 
> the
> newer ones fail. 
> There is a lot of tension on that multi groove pulley, especially 
> when
> hams have a tendency to overload their tower. It's not just wind 
> load
> but
> weight. Those towers have a weight limit. Add it all up, mast, 
> rotor,
> antennas, cables, etc and I'm sure you'll see more weight then you
> thought.
> 
> Regular maintenance and inspections should be done.
> 
> Skip, _KJ6Y_ (http://www.kj6y.com/) 
> _Communications Service Co_ 
> (http://www.communicationsserviceco.com/) 
> 818-887-3569
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
> 
 
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