In mechanical engineering, a shaft is a rotating machine element, usually circular in cross section, which is used to transmit power from one part to another, or from a machine which produces power to a machine which absorbs power.
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Types
They are mainly classified into two types.
Transmission shafts are used to transmit power between the source and the machine absorbing power; e.g. counter shafts and line shafts.
Machine shafts are the integral part of the machine itself; e.g. crankshaft.
Axle shaft.
Spindle shaft.