[TowerTalk] Rotatorplate

[K8RI]

On 12/17/2011 5:41 AM, Mika Liimatainen wrote:
> I mean the hole which is the highest pic.
>
> http://www.arraysolutions.com/Products/cmwrotor&bearingplates.htm

Now I understand. Unfortunately the answer is "BIG" The diameter of the 
bottom plate shown in photo 21 on http://www.rogerhalstead.com/Gears.htm 
   is just over 5 1/8" or 13.2 cm in diameter.  I believe the new 
versions are the same size or very close to it.
The diameter of the rotator base is 8" (20.32 cm) with a bolt circle of 
6 1/2" (16.51 cm).  You would need to enlarge the hole in that plate to 
over double the stock size just to get the rotator bottom plate through 
it.  IE from about 5 cm to 13.2 cm for the stock tower top plate.

IF OTOH you developed an alternative mounting you could probably mount 
the entire direction pot assembly below the plate although that could be 
a bit difficult as the pot mounts on that large base plate shown in 
photo 21 and couples to the rotator output shaft via a shallow slot in 
the end of the shaft and and a pin through the shaft of the pot.  If you 
have access to the machine tools you could fabricate a new mounting 
system for the pot

Typical though is to have to remove the rotator to get at the pot.

73

Roger (K8RI)

>
> Mika oh6nvc
>
>
>
>
>> On 17/12/2011 10:03, K8RI wrote:
>>> On 12/17/2011 3:44 AM, Ian White GM3SEK wrote:
>>>> Watch out for PST rotators in a tilt-over tower, because the water
>>>> shield over the top seal is only fully effective while the tower is
>>>> upright. If the tower is routinely tilted over for storms, it is
>>>> advisable to protect the rotator from driving rain.
>>> If you lay it over so the output shaft is horizontal any water that gets
>>> in should run right back out. I'd be more concerned about driving rain
>>> and wind with the thing upright. If water can still be trapped under
>>> that cover it could still suffer from the old problems.
>> Not so Roger, if the unit is on its side water can and will get into the
>> top bearing, Like most rotors they are only intended to shed water.
>> Water can also get through the mild steel plate / rotor housing
>> interface on the bottom. The pot is vulnerable in these circumstances.
>>
>> If the unit is used on a tiltover tower its worth spacing the rotor off
>> the plate by a few mm to allow drainage and using a temporary cover to
>> protect everything when horizontal, a plastic fertilizer bag works well.
>>
>> And yes it was a very good suggestion to improve the paint coating, well
>> worth ten minutes of prevention.
>>
>>
>>
>> --
>> 73 de Paul GW8IZR IO73TI
>> http://www.gw8izr.com
>>
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