ferret141:
I am trying to build a ball sorter. There are two types of ball I need to sort; one made of acetal the other nylon. Both are 20mm in diameter. I don't have the balls to hand but I need this built beforehand. I've calculated the acetal ball to weigh approximately 5.8g and the nylon ball to weigh 4.6g.
Is discrete mechanical weighing/sorting part of the requirements, or is that just the solution you preferred? I suppose it could have been specified like that just to force you to tackle the design issues, but there are other possible approaches to differentiate based on density or mass, some much simpler.