Approximate shaft dimensioning according to Niemann 2001, 3rd edition, page 742

For the design engineering of shafts and axes with full circle profile, the required dimensions will be estimated with an approximate calculation. Materials can be selected from a database. Individual materials, including the definition of maximum permissible torsion and bending tension, can be also used. Four different load types are available for the calculation:

• Solid axle (bending)
• Revolving axle (bending)
• Shaft (torsion)
• Shaft (torsion and bending)

After the input of the loads (bending load, torsion load or both) and the desired safety factor, the required minimum diameter will be calculated.