[TowerTalk] Sprockets with 2" bore needed

[K1TTT]

I would find a chain that will handle the force plus safety factor then get
a sprocket that is meant for it.  If the chain can handle it hopefully they
have designed the sprocket to be better than the chain.  Don't just go with
industrial suppliers, check automotive, motorcycle and atv parts suppliers
also.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net


-----Original Message-----
From: K8RI [mailto:K8RI-on-TowerTalk at tm.net] 
Sent: Friday, April 27, 2012 21:00
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Sprockets with 2" bore needed

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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