Machine Design
Coaxing is the procedure of increasing

Metal resistance to corrosion by coating
Metal strength by cycling
Metal hardness by surface treatment
Fatigue limit by over-stressing the metal by successively increasing loadings

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Machine Design
The angle of twist of shaft is

Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²

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