I'm trying to think of a way to build a bike powered butter churn. My wife has started making homemade butter by shaking whipping cream in a jar. It works but takes a while and it's alot of shaking.
I'm interested in designing a bike powered shaker of some sort. I'm thinking of a roller attached to a wheel which has an offset arm, something like a train. as you pedal it rotates the arm in a circular motion, shaking the jar.
I'm not very inventive though, so if anyone has any ideas to help me out that would be great.