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

[Scott MacKenzie]

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 at contesting.com] On Behalf Of
KJ6Y at aol.com
Sent: Saturday, October 13, 2012 1:37 PM
To: dino at kx6d.com; towertalk at 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
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