Shaft (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. The various members such as pulleys and gears are mounted on it.
They are mainly classified into two types.
- Up to 25 mm steps of 0.5 mm
- 25 mm to 60 mm with 5 mm steps
- 60 mm to 110 mm with 10 mm steps
- 110 mm to 140 mm with 15 mm steps
- 140 mm to 500 mm with 20 mm steps
The standard lengths of the shafts are 5 m, 6 m and 7 m.
The following stresses are induced in the shafts.
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- 112 N/mm2 for shafts with allowance for keyways.
- 84 N/mm2 for shafts without allowance for keyways.
The maximum permissible (design) shear stresses may be taken as:
- 56 N/mm2 for shafts with allowance for keyways.
- 42 N/mm2 for shafts without allowance for keyways.