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This video shows different parts and operation of the universal shaft. Spicer universal joints for motor cars, 1916. The main concept of the universal joint is based on the design of gimbals, which have been in use since antiquity. One anticipation of the universal joint was its use by the ancient Greeks on ballistae. [2]
Welding joint. In metalworking, a welding joint is a point or edge where two or more pieces of metal or plastic are joined together. They are formed by welding two or more workpieces according to a particular geometry.
A knuckle joint on a locomotive, seen behind the pin joint of the eccentric crank. Ball-point pen included for size. A mechanical joint is a section of a machine which is used to connect one or more mechanical parts to another. Mechanical joints may be temporary or permanent; most types are designed to be disassembled.
The joint is then heated, typically by using a propane or MAPP gas torch, although electrically heated soldering tools are sometimes used. Once the fitting and pipe have reached sufficient temperature, solder is applied to the heated joint, and the molten solder is drawn into the joint by capillary action as the flux vaporizes. "Sweating" is a ...
The universal class of needles are used on domestic machines. "Universal" refers to the shape of the needle shank and length of the needle rather than the actual sewing application or point. The most notable feature of universal needles is the flat face on the needle shank which helps to ensure the needle is inserted correctly.
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