On 4/6/2012 12:16 AM, Stan Labinsky Jr. wrote:
> What would happen if you could mark exactly on the mast where the rotor
> clamp faces contact it.
> Then, grind narrow vertical troughs into the mast coinciding with the
> contact points... sorta like a three or four point spline or torx drive bit.
That gets us back to some where between pinning and splining. Both can
tear apart any of the ham/tail twister rotators with large antennas and
Too many are assuming that eliminating slippage is a good thing. None,
and I repeat, none of the ham series., including the tail twister are
rotators for large antennas or arrays and particularly when very windy
conditions are encountered.
If you have a large antenna or array and do not want it to slip, by far
the easiest is to go with one of the larger rotators using double worm
gear drives. They have horrendous torque, and do not require a wedge
brake and the associated design failings that go with them. That and you
can purchase a Alpha Spid for only a couple hundred dollars more than
the tail twister and without its design flaws. Yaesu's larger rotators
have planetary gears and do not require wedge brakes. There are quite a
few rotators that use either planetary or double worm gears that are
well worth the money.
> I would expect that it would greatly increase the holding power, and if done
> right could still provide a break away so the rotor didn't become junk in
> the once-in-a-century storm..
> ----- Original Message -----
> From: "Ken Eigsti"<email@example.com>
> Sent: Thursday, April 05, 2012 3:28 PM
> Subject: [TowerTalk] HAM IV Slippage
>> RE: Mast slippage
>> Here is what has worked for me regarding slippage of the mast in the rotor
>> (mainly with HAM IV an T2W) but I am sure it would work with others.
>> I learned of this trick from W0BV. (Need to give credit where it is due)
>> Go to you local tire shop and get an old inner tube. Cut a piece that will
>> fit in the area between the rotor clamp and the mast. When you tighten
>> clamps it is almost impossible for the mast to turn. It is simple and yet
>> does not have the effect of what "pinning" does. I imagine with a strong
>> enough wind it would still "release" and turn, but so far it has solved my
>> problem. It also seems to act as somewhat of a cushion for vibration and I
>> have not had nuts loosen on the U bolts.
>> GL Ken W0LSD
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