Machine Design
In a hydrodynamic lubricated bearing

There is no lubricant between the journal and the 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
The lubricant is forced between the journal and the bearing, by external pressure

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Machine Design
Turn buckle has

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

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