Really big sproket

[Solace]

Originally Posted by crazykid234

Thanks, but that was the first sproket I tried, and it only goes to 60 teeth, or about a 6" od, I need some thing twice that size, so unless someone can tell me how to make custom I-sprokets, that doesn't help much. thanks though!

is it necessary that this sprocket have continous motion?

I am assuming that you need a sprocket of this size so as to increase your torque for picking up a large arm of some sort. As a general rule, a large arm affixed to a robot will never rotate more than, say, 300 degrees. If this is the case, you don't need an actually sprocket.

If you make a large wheel out of plywood or aluminum, it will serve the same purpose. simply wrap the chain around it and pin it in place on the wheel. because the chain is actually attached to the wheel, it cannot rotate past a certain point, but that's ok if your arm can't go that far anyways. you can usually make something like this to give you about a turn and a half of rotation, so say 540 degrees (more than enough). it also gives you the freedom to make it any size you want, and its lighter cause you can make it out of something that weighs a lot less than steel.