[TowerTalk] Sprockets with 2" bore needed

[K8RI]

On 4/27/2012 11:29 PM, Grant Saviers wrote:
> Browning is another choice for sprockets.
>
> Why not use a timing (synchronous) belt instead?  It won't rust and can
> be sized for any load you might need.

I like timing belts, but they can be a bear to change in this 
configuration while chains are easy. Just remove the master link and 
they come right out. The timing belt likely involves disassembly on both 
the rotator and mast sides to be able to remove the belt.

73

Roger (K8RI)

>
> http://www.emerson-ept.com/eptroot/public/prod/dynamic_frame.asp?strMain=http%3A//www.emerson-ept.com/eptroot/public/bnames/browning/Browning.htm
>
> Applied Industrial Technologies also stocks sprockets, chain, belts, etc.
>
> http://web.applied.com/base.cfm?page_id=3397
>
> Grant KZ1W
>
> On 4/27/2012 2:00 PM, K8RI wrote:
>> On 4/27/2012 4:34 PM, Jim Hoge wrote:
>>> Check McMaster- Carr. They list them but with a higher price tag. The manufacturer you want to search is Martin Sprocket and Gear. Any supplier of power transmission equipment ought to carry them. If you can tolerate a larger outside dimension then you can away from searching for only finished bore sprockets and go for bushing bore sprockets as well.
>> I had e-mailed them earlier.  I just received a reply back stating they
>> could not make a recommendation for my application which was:
>> 2" ID/Bore, finished or machinable, OD of roughly 4" and a linear force
>> on the chain of 500# which includes a safety factor.
>> I know I've seen systems that ran far more force than this.
>>
>> Torque on the 2" shaft is roughly 1000 inch # at maximum wind gust. With
>> an OD of 4" this is reduced to 500# which would translate to 500 linear
>> #  on the chain.
>> OTOH the small rotator can go to about 1500 in # so that would translate
>> to  750 # of linear force on the chain.
>>
>> I have looked at the bushing bore sprockets, but not specked any out.
>>
>> 73
>>
>> Roger (K8RI)
>>
>>
>>
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