An engine is coupled through a belt drive to rotate an air compressor, which must operate at 1200...

Question

An engine is coupled through a belt drive to rotate an air compressor, which must operate at 1200 rpm clockwise. The diameter of the motor sheave is 4 in. and the sheave on the compressor is 10 in. Determine the required speed of the engine and the belt speed.

Robert · Accepted Answer

Calculate the speed of the driver sheave. 
Determine the velocity ratio as show below:
Here, 
The velocity ratio is  
The diameter of the driver sheave is  
The diameter of the driven sheave is  
Substitute for  and  for
Use the fact that the belt speed,

An engine is coupled through a belt drive to rotate an air compressor, which must operate at 1200 rpm clockwise. The diameter of the motor sheave is 4 in. and the sheave on the compressor is 10 in....

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