Electrical discharge machining (EDM) is a process in which items are manufactured using sparks produced by electricity. The material used for the manufacturing of an item is placed between two electrodes. Electrical voltage is passed between the two electrodes but due to the item in the way, a spark occurs. The voltage is sent if rapid pulses resulting in a steady stream of sparks. These sparks are used to shape the item you want.
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Hydraulic systems have been used for hundreds of years to make labor easier. That's because instead of trying to come up with enough manpower to lift something very heavy or move it, using liquid placed under pressure is much easier and doesn't take as much work. These days, hydraulics are found in many places and are used for many things, including things like a car's hatchback, a store's door, and even a large crane.
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