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REVERSING PULLEY ROTATION - ANSWER

V. Ryan 2010-17

 

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1. A system of four pulley wheels are set up as shown in the diagram above. The driver pulley rotates in an anti-clockwise direction. In what direction does the output pulley wheel revolve ?

Look at the animation below. The final output of pulley F is a clockwise movement.

   

   
 
   

2. If pulley A (driver) rotates at 60 rpm what is the output rpm at F.

   

To answer the question spit the pulleys into pairs and work out the velocity ration of each pair. Treat the pairs of pulleys as separate questions.
Use the diameters when dividing and place the largest number on the top of the division.

   

   

Pulley wheel A has an rpm of 60. Pulley B is larger and so revolves at a lower rate than A. This means that the rpm of A is divided by the ratio of 2.

 

   

Pulley wheel C has the same rpm as pulley B because they form a compound pulley. Pulley D is larger and so revolves at a lower rate than C. This means that the rpm of C is divided by the ratio of 1.2

   

   

Pulley wheel E has the same rpm as pulley D because they form a compound pulley. Pulley F is smaller and so revolves at a higher rate than E. This means that the rpm of E is multiplied by the ratio of 1.3

   

   
   

   

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