Reasons for Failure in Shafts

fatigue

over torque/load

shock loading

imbalance

1. Fatigue

2. Overload - Simple (Excessive Load) , complex (Norma/ Excessive Load combined with another stress eg Torsional+bending)

UD15

Spin a race in a bad bearing.

1) Incorrect selection for application

2) User error

3) Manufacturing defect

......

• Earthquakes
• Rotten timbers
• Water saturation of soil
• Not maintained properly
  

and there are probably a dozen more

are you talking about shafts to connect machinery

or shafts as in mining

or ventalation shafts

Shaft may refer to:

Long narrow passages:

• Elevator shaft
• Ventilation shaft
• Shaft (civil engineering)
• Pitch (vertical space), a significant underground vertical space in caving terminology
• Shaft mining
• Shafting, illicit travelling through shafts

Long narrow rigid bodies:

• Axle, a shaft around which one or more wheels rotate
• Drive shaft, a shaft for transferring torque

In fiction:

• 1971 novel by Ernest Tidyman about an African-American private detective
• Shaft (1971 film), a film based on the novel
• Shaft (album), the soundtrack for the film, recorded by Isaac Hayes
• "Theme from Shaft", performed by Isaac Hayes
• Shaft's Big Score, the second film in the trilogy
• Shaft in Africa, the third film in the trilogy
• Shaft (2000 film), a follow on of the 1971 film, released in 2000
• Shaft (TV series), a series of TV movies
• John Shaft, the title character of the above films
• Shaft (Castlevania), the dark priest from the Castlevania video game series
• Shaft (Marvel Comics), a Marvel Comics ninja character
• Shaft (comics), a comic book character created by Rob Liefeld for his comic Youngblood
• a weapon in the Quake video game series
• a horror movie, The Shaft

Music:

• Shaft (rave), a UK dance music act which had a 1991 hit with 'Roobarb and Custard' sampling vintage children's television programme 'Roobarb'
• Shaft (band), a dance music act which had a 1999 hit with a cover/remix of (Mucho Mambo) Sway
• Shaft (New Zealand band), a New Zealand indie band
• Shaft (club), a blues and jazz club in Istanbul, Turkey

Places:

• Borden Shaft, Maryland, formerly called Shaft
• Shaft County, an administrative division of Gīlān Province in Iran
• Shaft, Iran, the capital of Shaft County

Other:

• Shaft (company), a Japanese animation company