Forces on a Pulley Shaft: Calculating Shear Forces and Power Requirements

AI Thread Summary
Calculating shear forces on a pulley shaft involves determining the torque based on the power supplied to the alternator and the angular velocity of the driven pulley. The relationship between torque and shear stress can be established using torsion theory, where shear stress is proportional to the torque applied and inversely related to the polar moment of inertia of the shaft. The dimensions of the pulleys, their RPMs, and the distance between them are critical for accurate calculations. Understanding these relationships allows for the assessment of shear forces acting on the shaft. Proper calculations will ensure the shaft can handle the operational loads effectively.
joe888
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Hi i need help calculating the shear forces on a pulley shaft. The pulley of the shaft drives another pulley conected to an alternator. the driver pulley is 160mm in diameter, the driven pulley on the alternator is 140mm. The distance between the pulleys is 664mm and the belt length is 1800mm. The speed of the driven pulley is 1200 RPM and the driver is 1050 RPM. The power to the alternator is 7 KW. Any help with where to begin would be appreciated thanks.
 
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joe888 said:
Hi i need help calculating the shear forces on a pulley shaft. The pulley of the shaft drives another pulley conected to an alternator. the driver pulley is 160mm in diameter, the driven pulley on the alternator is 140mm. The distance between the pulleys is 664mm and the belt length is 1800mm. The speed of the driven pulley is 1200 RPM and the driver is 1050 RPM. The power to the alternator is 7 KW. Any help with where to begin would be appreciated thanks.

With the power to the alternator and the velocity (angular) of the driven shaft, what is the torque on the shaft?

How does torque relate to shear stress? (Hint: think about torsion theory)
 

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