How Fast is it Turning

Speed Ratios of Pulleys and Motors

Determining the speed of a spindle driven by an electric motor or choosing the proper size pulley so that the speed of the driven spindle, being a saw blade, grinding wheel or buffing pad is easily determined by this formula.

 

This formula compares the ratios of the size and speed of the pulleys and can be used to find any one of the above unknowns as long as any three are known.  

     

 

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