They have a large machine. They pour a mixture of iron and carbon and some trace metals in one hopper, and recycled Schwinn handle bar grips in another hopper, and five minutes later a new Scrap Yard knife comes out. All they need to do is count them and turn the machine on and off. And shovel the coal. A huge coal-fired mechanical computer with lots of wheels and gears does all the rest. I hope that helps.