Machine Design
The acme threads are usually found on

Feed mechanism of machine tools
Screw cutting lathes
Spindles of bench vices
Railway carriage couplings

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Machine Design
Slenderness ratio is the ratio of

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

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