Machine Design
The design of shafts made of brittle materials is based on

Guest's theory
St Venant's theory
Rankine's theory
Von Mises theory

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

The new belt will carry more than its share and result in short life
Only one belt cannot be fitted with other used belts
Belts are available in sets
New and old belts will cause vibrations

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Machine Design
In oilness bearings

Grease required to be applied after some intervals
Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal

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