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November 27, 2014

November 27, 2014

Posted by **Henri** on Sunday, March 22, 2009 at 9:16am.

a) Find the diameter of the bolts.

b) Find the inside diameter of the hollow shaft.

Where do I start?

Note: Solid shafts and hollow shafts system are used in low stress,low RPM applications, like a large air fan. The solid shaft comes from the motor and the hollow shaft will be used on the fan.Because of the lighter hollow shaft a smaller driving motor can be used.They are usually connected by a flange welded over the smaller diameter solid shaft. The flange outside diameter is equal to the hollow shaft outside diameter.The shafts are then secured together by bolts.

- Torque and shear stress -
**drwls**, Sunday, March 22, 2009 at 4:55pmFor the shear stress (in terms of the torque) use

http://www.engineeringtoolbox.com/torsion-shafts-d_947.html

Then use that stress for the diameter of the bolts. Assume the torque is distributed evenly over the bolt cross sectional areas. I don't see what the thread pitch has to do with it.

- Torque and shear stress -
**Henri**, Sunday, March 22, 2009 at 10:33pmThanks... I couldn't figure out why there's is a thread pitch either!!!

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