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A crankshaft is a rotating shaft in an engine that converts reciprocating motion into rotational motion. The manufacturing process of a crankshaft involves several steps, including forging, machining, and heat treating.
Forging is the first step in the manufacturing process. Crankshafts are typically forged from either steel or aluminum. The forgings are then machined to the desired shape and size. Heat treating is the last step in the manufacturing process. Crankshafts are heat treated to increase the strength of the metal.