[TowerTalk] Sprockets with 2" bore needed

[K8RI]

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)