Machine Design
In a hydrodynamic lubricated bearing

There is a thick film of lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure

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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

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

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Machine Design
Turn buckle has

Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends
Left hand threads on both ends
No threads

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