I've always wondered how food packagers hit precise weights with multiple items that are different sizes. For instance, if you buy a 12-oz. package of unsliced mushrooms, they're not all the same size--does somebody have to sit there and randomly take different mushrooms in and out to hit the numbers?
No. Instead, they use this machine that does the math for you, and gives feedback with red and green arrows:
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It's very cool. I used to work at a company that produced clothes pegs, they used a similar process for counting pegs so each bag had the correct amount. A conveyor belt took the pegs from the floor up into a hopper where they were slowly scattered onto a large segmented circle. Think of a large pizza. Each segment had its own scale and a very fast trap door. When a combination of segments hit the desired weight their trap doors opened dumping the pegs into a chute and down into the bagging operation. I imagine the same process is used for lots of small loose items and probably food like candies etc too.