Hi everyone. I am part of a team were our aim is to fight off robots which we build for fun. Our design was a ball robot, which simply uses its mass (with high defense hopefully) to 'crush' opponents. Anyway, the problem is I was looking for a metal sphere for our robot, or preferably two hemispheres which we can attach together with screws, however due to where I live I can't really find any. The only metal scrapyards that exists have stores where you buy sheets of metal or can ask for a custom shape, however I imagine that they are expensive. I don't really have many tools available, mostly just a dremel, but I may have a friend who has some tools, but I doubt they do much. I was wondering of we could get a mold, buy a sheet of metal and hammer the thing into shape. I don't know if that would result poorly, or if we can find a mold strong enough to bash with a hammer. Also, the metal has to be fairly strong because other people will be using weapons like hammers against us, so there is a bit of a contradiction with trying to use a hammer to bang it into shape. As you can see, our team is a bit stuck. I thought you guys might have a few ideas to help the problem. Thanks!