How can I make a giant bike cog like this one? Answered
Here's a site with the inspiring article: http://www.cnet.com/news/fast-fixie-bicycle-with-giant-chainring-aims-for-100-mph/
Anyways, I want one. First of all I would suppose I'd need a pattern. What program would you suggest I used to make a pattern? A solid circle of metal with teeth on it will do. I'm thinking of gluing a pattern to a piece of metal, cutting it out as best I can with a grinder then going bike to clean it up with a tungsten carbdide dremel bit. I gues it could be a few thinner sheets of metal that could be spot welded together. I dont have any tech shops/idea foundries in my town. I say that because I'm wondering could I just create some type of file that a mill machine could read and cut it out for me? I have a couple different reasons for wanting a larger cog, the practical one being I want a cog large enough that the pedals would be moving around very slowly so you could just shift your weiht back and forth, more falling with your body weight than pedaling. The 2nd reason, more lofty and long term goalish is if you can get this much power from a bike, to propel it 100 mph, it just seems reasonable that a human powered aircraft is within reach, as in attatch a hang glider to a bike and have the pedaling able power a propeller once airborne. Anyways, how would you go about making a giant cog?