
Shaft Diameter Calculations  
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Posted by: mikee122 ^{®} 04/27/2007, 16:04:08 Author Profile eMail author Edit 
I am looking for either a simple formula or simplified formulas to determine the min. shaft diameter. For example I know the torque vaule, the type of loading (repeated torsion), the length of the shaft with the maximum amount of Angle of twist. T=50,000
I plan on using 4140 Steel, normalized (TS 148,000 psi, YS 95,000 psi) In the event there are several formulas please list in a logical order 
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Re: Shaft Diameter Calculations  
Re: Shaft Diameter Calculations  mikee122  Post Reply  Top of thread  Forum 
Posted by: bobthedog ^{®} 04/29/2007, 12:46:41 Author Profile eMail author Edit 
Hey just wondered are u doing the ics engineering course To proceed mike Torque is measured in kjoules 1000 joules equal one killer joule Loading 4 what does that mean 4 what Also is with that steel 4140 TS AND YS is YS YIELD STRENGTH WHAT IS TS ??? Got about 4 equations for u but wanted to find that out ok cheers.
DONT GIVE UP THE FAITH 
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Re: Re: Shaft Diameter Calculations  
Re: Re: Shaft Diameter Calculations  bobthedog  Post Reply  Top of thread  Forum 
Posted by: bobthedog ^{®} 04/29/2007, 13:03:59 Author Profile eMail author Edit 
Torque is also measured in oz aswell sorry onces
how to work out 1/16 of an inch and 3/16 of an inch on a calculator etc how its put onto the calculator and to do Also m2 is meteres squared but m 3 is meters cubed where on the calculator is meters cubed button thanks DONT GIVE UP THE FAITH 
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Re: Shaft Diameter Calculations  
Re: Shaft Diameter Calculations  mikee122  Post Reply  Top of thread  Forum 
Posted by: materialboy ^{®} 04/28/2007, 07:21:34 Author Profile eMail author Edit 
The diameter is with in ur values. Torque = radius * perpendicular force F where Loading gets to be the perpendicular force because it is the shaft. What value is loading of 4 ??? r = Torque/ Force F

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Re: Re: Shaft Diameter Calculations  
Re: Re: Shaft Diameter Calculations  materialboy  Post Reply  Top of thread  Forum 
Posted by: mikee122 ^{®} 04/28/2007, 11:44:12 Author Profile eMail author Edit 
Could you please clarify. I am trying to determine the diameter. I don't have a diameter value
In r=Torque/Force would not the Torque be equal to the perpendicular loading? I am referencing a chart that states that shows the loading value based on the type of loading. Manner of loading Design factor Design shear stress
T=50,000
I did make a minor change to the material I would like to use. I plan on using 4140 Steel,OQT 700 (US 231 ksi/1593 MPa,

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Re: Re: Re: Shaft Diameter Calculations  
Re: Re: Re: Shaft Diameter Calculations  mikee122  Post Reply  Top of thread  Forum 
Posted by: materialboy ^{®} 04/29/2007, 11:43:49 Author Profile eMail author Edit 
How far I understand, Torque = Radius*Prependicular Force
So, in your question, Force will be created by perpendicular loading. Hence, if your loading is acting prependiculary than yes it will replace perpendicular force. Manner of loading Design factor Design shear stress
What does your [s sub y/2N] stands for ??? _____________________________________ 
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Re: Re: Re: Re: Shaft Diameter Calculations  
Re: Re: Re: Re: Shaft Diameter Calculations  materialboy  Post Reply  Top of thread  Forum 
Posted by: mikee122 ^{®} 04/29/2007, 15:58:43 Author Profile eMail author Edit 
I am doing a strength of materials course fir Mech. Design. Our text book is Strength of Materials, 4th edition by Robert L Mott The table is
T=50,000 lbft
I plan on using 4140 Steel,OQT 700 (US 231 ksi/1593 MPa,
T sub d= s sub y/2N is the formula for Design shear stress.

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Re: Re: Re: Re: Re: Shaft Diameter Calculations  mikee122  Post Reply  Top of thread  Forum 
Posted by: materialboy ^{®} 04/30/2007, 06:56:12 Author Profile eMail author Edit 
Well if you understand the meaning of MPa and stress, u won't ask on the prependicular. Ur answer is with in the statement u have just written. 
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