Shaft Diameter Calculations
Since a shaft is subjected to torsion while rotating, if the force turning the shaft is (F), the shaft radius is (r), and the rpm is (n), then the distance traveled by the shaft in 1 second is:
Table of cross-section, moment of inertia, section modulus, and radius of gyration for shafts and journals (above)
Sample Problem for Calculating Shaft Diameter
A shaft transmits 10 hp at 600 rpm, with an allowable shear stress (τallow) of 250 kg/cm². Calculate the shaft diameter.
Solution:
Sample Problem for Shaft Diameter Calculation on a Hollow Shaft
A shaft has been bored out to 3/5 of its diameter. This shaft transmits 250 hp at 200 rpm, with an allowable shear stress of 180 kg/cm². Find the shaft’s diameter.
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