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**1. The problem statement, all variables and given/known data**

Two axels of steel are connected with gears. Both axels have the same diameter (d) and length (1000mm). Diameter of gear B is 150 mm and diameter of gear C is 450 mm. Gear D is stationary. A torque of 100 Nm is applied to gear A.

Maximum allowed shearstress in the axels are 60 Mpa. Shear modulus of the steel the axels are made of is G = 8*10^4 Mpa

a) Calculate the necessary axel diameter (d) and the angle of twist (in degrees) that gear A will move.

b) Calculate the necessary axel diameter when the angle of twist in axel CD is 0,25 degrees. Both axels have the same diameter.

https://dl.dropboxusercontent.com/u/11241083/problem_axle.png [Broken]

**2. Relevant equations**

https://dl.dropboxusercontent.com/u/11241083/formulas_axle.png [Broken]

https://dl.dropboxusercontent.com/u/11241083/formulas_axle.png [Broken]

**3. The attempt at a solution**

https://dl.dropboxusercontent.com/u/11241083/answer_axle.png [Broken]

https://dl.dropboxusercontent.com/u/11241083/answer_axle.png [Broken]

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