Machine Design
A screw will be self locking, if

Friction angle is more than helix angle
Friction angle is equal to helix angle
Friction angle is less than helix angle
Efficiency of screw is 100%

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Machine Design
Slenderness ratio is the ratio of

Effective length of column to width of column
Width of column to depth of column
Effective length of column to least radius of gyration of the column
Maximum size of column to minimum size of column

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