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Re: [TowerTalk] Sprockets with 2" bore needed

Subject: Re: [TowerTalk] Sprockets with 2" bore needed
From: K8RI <>
Date: Fri, 27 Apr 2012 17:00:15 -0400
List-post: <">>
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.


Roger (K8RI)


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