Calculating Torque and Strength of Materials

[thspoq2]

Im including a scan of the problem and my work, please let me know if I did this right. Sorry about the sloppy handwriting.
http://img244.imageshack.us/img244/6521/strengthsproblem3rk.th.jpg
http://img241.imageshack.us/img241/8866/strengthsworkedout1rw.th.jpg

 

[Cyrus]

Link don't work

 

[thspoq2]

Link don't work

Fixed, thanks

 

[thspoq2]

Nobody? Am atleast on the right track? I wish there was a way to check these sort of problems.

 

[FredGarvin]

You might check your torque calculation. Using the numbers you are using, the equation should be (torque will be in ft-Lbf): $$P = \frac{T \omega}{5252}$$

I would do a quick and dirty compare using a rule of thumb based on distortion energy

$$T = \frac{\pi d^3}{16}(.58 S_y)$$

I think you've got the right idea though.