Quote:
Originally posted by monsieurcoffee
I would just cut out the idea of aluminum or steel sprockets. Because drive gears/sprockets are under constant force and stree during the match, you want to use steel or cast iron. It's heavy, I agree, but it is the best choice. Our team gets sprockets/chains/gears machined by Borg Warner people and realize they make 90% of the world's small car chains and 80% of the larger automobile chains... such schweet quality.
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Cast iron? That is a little brittle and extremely heavy if I remember correctly. I think you may be refering to gears made of pressed powdered metal like the old chiaphua gear cluster. If you want a good idea of how hard that thing was, try to grind it off. The lathe wouldn't even scratch it.