• Machine Elements Design ( PRD 214 )

Manufacturing Consideration in Machine Design

Simple Stress in Machine Parts

Selection of Engineering Materials

Design of rotating shafts

• Shaft Design

  • Shaft hub connection( keys, splines , fit connection )
    
  • Shaft Connections
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  • Keys & Splines

  
  

  Summary Of Shaft Design

  
  

  A shaft is the component of mechanical devices that transmits mainly the Power and hence rotational motion.

  It is integral to such devices as gear-type speed reducers, belt or chain drives, conveyors, pumps, fans, agitators, and many types of automation equipment.

  In the process of transmitting power at a given rotational speed, the shaft is inherently subjected to a torsion moment, or torque. Therefore, torsion shear stress is developed in the shaft.

  Also, a shaft usually carries power-transmitting components such as gears, belt sheaves, or chain sprockets, which exert forces on the shaft in the transverse direction. These transverse forces cause bending moments to be developed in the shaft. requiring analysis of the stress due to bending

  
  

  
  

  

  The equation used in Shaft Design

  
  

  

  
  

  

  M.S.S. = maximum allowable shear stress

  f1= maximum allowable stress

  d = outside diameter of shaft

  K = inside diameter / outside diameter

  Km = combined shock and fatigue factor for bending

  Kt = combined shock and fatigue factor for torsion

  F = axial force

  M = bending moment

  T = torque

  column action factor

  
  

  

  use for L/k<115

  
  

  use for L/k>115

  
  

  
  

  
  

  

  L = length of shaft between bearings

  k = radius of gyration of shaft cross section

  Syc = yield strength in compression

  E = modulus of elasticity

  n = 1.6 for ends partly restrained (as in bearings)

  n = 1 for hinged ends (as in self-aligning bearings)

  shaft	load applied	Km	Kt
  stationary	gradually	1.0	1.0
  ،@	suddenly	1.5-2.0	1.5-2.0
  rotating	gradually	1.5	1.0
  ،@	suddenly, minor shock	1.5-2.0	1.0-1.5
  ،@	suddenly, heavy shock	2.0-3.0	1.5-3.0

  
  

  Design of welded joints

• Design of Riveted joints

• Design of power screw

  Design of screw joints

  Design of Springs

  Design of thin cylinders and sealing

  Application of computer aided design

  
  

  References :

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