[TowerTalk] homebrew rotator

[Roger (K8RI) on TT]

Yes it kinda does <LOL>

73

Roger (K8RI)

On 6/1/2016 Wednesday 7:38 PM, Bob K6UJ wrote:
> wow Roger,
>
> Reminds me of the movie Crocodile Dundy.
>
> "You call that a knife (rotator)  now here's a knife (rotator)"
>
>
> Bob
> K6UJ
>
>
>
>
> On 6/1/16 4:11 PM, Roger (K8RI) on TT wrote:
>> Here's a home built, chain drive that might turn your whole house.  
>> He used it to tun the top section of a massive tower that could be 
>> seen from  10 to 12 miles.Top two photos on 
>> http://www.rogerhalstead.com/ham_files/skyhook.htm  the whole drive 
>> is not shown, but what is shown should give a good idea as to the 
>> size. Definitely not a bicycle chain!  I think he used two heavy chains.
>>
>> John's station looks dated, but the photo was shot around 2001.
>>
>> Industrial chain, gears and idlers can be found at on-line auctions. 
>> I purchase a chain and gears for a planned, but much smaller scale 
>> drive that has never materialized...as of yet and probably never 
>> will. The cost was surprisingly little.
>>
>> There is "no slack" in this system so be sure to use a heavy (strong) 
>> spring loaded idler to protect the system and particularly the chain.
>> OTOH if the chain is not "tight" to allow some slack, the shock to 
>> the antennas, chain and motor gear reduction can be substantial.
>>
>> John built that entire tower with the help of his brother-in-law and 
>> it was on a city lot.
>> IIRC John died just two years after getting the system operational.  
>> His family put the tower up for sale, then on e-bay. It could be had 
>> for taking it down, but they eventually gave it to a power company 
>> for taking it down.
>>
>> The cost?  In the Year 2000, you could have purchased  a new Corvette 
>> for just the cost of the materials..
>>
>> 73
>>
>> Roger (K8RI)
>>
>>
>> On 6/1/2016 Wednesday 3:22 PM, Danny Pease wrote:
>>> I have been intrigued with putting together my own antenna mast 
>>> rotation
>>> system and wondered if anyone has any info on using a rack and 
>>> pinion gear
>>> type system in conjunction with a linear actuator. If the rack and 
>>> pinion
>>> turns out to be too expensive, my second choice would be a chain 
>>> drive with
>>> the linear actuator.
>>>
>>> Thoughts?
>>>
>>> Danny NG9R
>>>
>>> _______________________________________________
>>>
>>>
>>>
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>>
>>
>
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-- 

73

Roger (K8RI)


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