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Unread 01-11-2012, 14:31
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Rob Stehlik Rob Stehlik is offline
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FRC #0610 (Coyotes)
Team Role: Engineer
 
Join Date: Sep 2009
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Location: Toronto
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Re: #25 Chain Drive Experience ???

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Where do you buy the thicker AL #25 sprockets ?
Unfortunately I don't have a source for aluminum sprockets other than Andymark. I was just pointing out the change in quality in recent years.

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I did some hunting around and found some aluminum sprockets with hubs made by Berg. These use set screw hubs and "pin hubs" so it may be best to broach a keyway in them.

www.wmberg.com/catalog/catpage.aspx?url=pdf/B05A107.pdf

I also found some glass reinforced nylon sprockets made by Torque Transmission.

torquetrans.com/roller-chain-sprockets/index.htm

I will give their distributors a call and see what their stock looks like.
These look interesting. Please let us know if you get pricing and availability. We tried using a large nylon sprocket from Mcmaster carr on our intake this year, and had trouble with the chain not engaging properly. The pitch seemed to be off for some reason.

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Generally chain "stretching" is every little join on every link wearing.
The reason you see more stretch on #25 is not because it is weaker but is because you have more links per inch to wear down.
This makes a lot of sense. Team 359 uses bike chain which is 0.5" pitch, but much narrower than standard #40 chain. I'd be curious to hear from them how much stretch they see (if any). My understanding is that bike chain is way stronger than #25, but lighter than #35. Unless you could adapt bike sprockets, you would have to make your own. Other than that, it seems to be a great compromise between #25 and #35 chain.

Rob