Shaft (mechanical engineering)
This article relies largely or entirely on a single source. (June 2021)
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.
They are mainly classified into two types.
The material used for ordinary shafts is mild steel. When high strength is required, an alloy steel such as nickel, nickel-chromium or chromium-vanadium steel is used. Shafts are generally formed by hot rolling and finished to size by cold drawing or turning and grinding.
- 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.
Usually 1m to 5m is used.
The following stresses are induced in the shafts.
- 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.