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Deflection in a shaft
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Posted by: JamesVernon

05/18/2004, 09:39:25

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Hey, I'm looking to find how much twist I have in a long drive shaft.  The shaft is driven over 15 ft from one end, and I want to select a suitable drive shaft which will have minimum twist.  Does anyone know the calculations I would need? 



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Re: Deflection in a shaft
Re: Deflection in a shaft -- JamesVernon Post Reply Top of thread Forum
Posted by: jcmcgraw
05/18/2004, 13:59:09

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According to the "Machinery's Handbood" the formula for Torsional Deflection of circular shafts is...

For a solid circular shaft the torsional deflection in degrees is given by:

< = (584Tl)/(D^4G)

< = angular deflection in degrees

D = diameter of shaft in inches

G = torsional modulus of elasticity = 11,500,000 lbs/square inch for steel

T = torsional or twisting moment in inch-pounds

l = length of shaft in inches

Hope this helps.


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