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  • Shafts: Design for bending and torsion, critical speed checks, keyway stress concentration, standard bearing fits. Typical shaft materials: C45/1045 steel, EN8, alloy steels for higher strength. Dimensional rules of thumb: minimum diameter for given torque and allowable shear stress: d = [ (16 T / (π τ_allow) ) ]^(1/3) for pure torsion.
  • Keys and keyways: Standard rectangular and square keys; shear and crushing checks; recommended keyseat depth and fillet radii; key material slightly softer than shaft for replaceability.
  • Bearings: Rolling-element bearing selection by radial load, axial load, dynamic load rating (C), life L10 calculation: L10 = (C / P)^p * 10^6 revolutions (p = 3 for ball bearings, 10/3 for roller). Lubrication considerations.
  • Gears: Spur and helical gear design — Lewis bending formula, AGMA strength and life checks, module selection, face width guidelines. Surface durability (contact stress) using Hertzian contact formulas.
  • Springs: Compression and extension spring design — Wahl’s factor for shear and spring index, solid height, free length, critical buckling conditions for long slender springs.
  • Fasteners: Bolt selection for static and fatigue loading; preload and grip length; combined shear and tension checks; thread standards.
  • Couplings and keys: Torque capacity and misalignment allowances.
  • Always use allowable stress with appropriate factor of safety for the application (fatigue, impact require higher n).
  • Pay attention to units; convert consistently (mm, N, MPa).
  • For combined loading, use equivalent stress theories (von Mises for ductile materials).

Bhandari, V. B. (2010). Machine Design Data Book. Tata McGraw-Hill Education. machine design data book by vb bhandari pdf 31

Loads & Stresses: Static Stresses, Fluctuating Stresses (including fatigue design), and Power Screws. Option 1: The "Student Lifeline" Perspective (Best for

Comprehensive Data: Provides exhaustive tables for material properties, stress analysis, and tolerances. Shafts: Design for bending and torsion, critical speed

Diverse Coverage: Over 28 chapters covering everything from basic tables to complex IC engine components. Core Topics Covered

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