2.72 Design Lab Meeting

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2.72 Design Lab Meeting

• Spindle Shaft

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(No Transcript)
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Solid modeling
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Solid Modeling dimensioned
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Machining Process
See also video clips
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Shaft Stiffness Calculations
E (Pa) R (m) I (m4) lengths (m)    
2.00E11 0.00635 1.27698E-09 0.0254    
  0.0133 2.45751E-08 0.1016    
  0.0113 1.28057E-08 0.022098    
  0.0075 2.48505E-09 0.016    
           
           
K's (N/m)          
46755694.92   1.70381E32   Stiffness (N/m) 10344878
14059381.15   1.64701E25      
712025637.2          
364020524          
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Possible Sources for Error
Thermal Expansion is negligible.
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Possible Sources of Error Cont.

• Deflection
• Three point bending would be greatest source of
  deflection.
• After calculating deflection using model, this
  error was considered to be negligible.
• Precision necessary to 7 microns,
• Deflection was on the order of 13 microns given
  1000N of perpendicular force.

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Measurements

• Diameters measured with Micrometer
• Lengths measured with Digital Calipers
• Radii measured with optical comparator
• All were within tolerances