Commonly used mechanical parts include the following: inclined plane type simple machinery: inclined plane, spiral, split. Simple lever machinery: lever, pulley, axle, gear. The engagement point of rotating parts in opposite directions, such as gears, mixing rollers, etc. The rotating shaft includes connectors, mandrels, chucks, screws, and rods. Rotating protrusions and holes. Rotating components with protrusions or voids are very dangerous, such as fan blades, camshafts, flywheels, etc. The bite point between rotating components and tangent moving components, such as power transmission belts and pulleys, chains and sprockets, racks and gears, etc. Mechanical parts, also known as machine parts, are the basic components that make up machinery and are inseparable individual components that make up machinery. Mechanical parts are not only a discipline that studies and designs mechanical basic components in various equipment, but also a general term for parts and components.