[TowerTalk] Rotor Stripping Gears?

[ve4xt@mts.net]

This is all a very good argument for an Alfa-Spid style of controller: mast 
slips, adjust the controller. Period. No climbing. No pinning. No stripped 
gears.

(At least until the slippage is, I think, 320 degrees, at which point you 
reach the upper limit of the box's ability to adjust.)

The Spid uses pulses to tell the controller the antenna's moving, so 
there's no physical connection between the mast and any indicator 
rheostat.



 
> From: "Al Williams" <alwilliams at olywa.net>
> Date: 2006/03/01 Wed AM 11:53:28 CST
> To: <towertalk at contesting.com>
> Subject: Re: [TowerTalk] Rotor Stripping Gears?
> 
> A cutaway drawing of the M2 2800 rotator shows five (5) regular type 
gears 
> between the mast clamp/mast and the worm drive!
>  I have noticed that there is a fair amount of movement of the boom 
caused 
> by the wind apparently acting on the backlash of the five gears.
> 
> The M2 specification lists a braking torque of 17000 in-lbs while also 
> stating that "Precision wormdrive - cannot be reversed by mast torque; 
NO 
> BRAKE RQD.  As mentioned by others M2 voids the warranty if the mast 
is 
> pinned to the rotator clamps.
> 
> Question is, what does M2 really mean by their braking torque and how 
was it 
> determined?  Also how does one determine the torque caused by the 
wind load 
> and inertial load of the antenna/mast assembly?
> 
> Also note that there are two long elements on one side of the mast vs 
only 
> one long element on the other side..
> 
> k7puc
> 
> ----- Original Message ----- 
> From: "peter.voelpel" <df3kv at t-online.de>
> 
> I learned it twice that worm-gear drive rotators also loose their gears.
> Two of my Prosistel PST2051 failed with a beam of 0,9m2 at 10m height 
and
> only 60km/h wind gusts at that time.
> The worm axle pushed the bearing completely out of the housing which 
> ruined....
> 
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