EXAMPLE QUESTIONS AND ANSWERS (3)
V. Ryan © 2001  2009
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When faced with three gears the question can be broken down into two parts. First work on Gears A and B. When this has been solved work on gears B and C. 

The diagram above shows a gear train composed of three gears. Gear A revolves at 60 revs/min in a clockwise direction. What is the output in revolutions per minute at Gear C? In what direction does Gear C revolve ?
First work out the speed at Gear B. (Remember B is larger than A therefore, B outputs less revs/min and is slower) Next, take B and C. C is smaller, therefore, revs/minute will increase and rotation will be faster. What direction does C revolve ? A is clockwise, B consequently is anticlockwise and C is therefore clockwise.




Gear A revolves at 90revs/min. What is the
output and direction at Gear C.
First work out the speed at Gear B. (Remember B is larger than A therefore, B outputs less revs/min and is slower). Next, take B and C. C is smaller, therefore, revs/minute will increase and rotation will be faster. What direction does C revolve ? A is clockwise, B consequently is anticlockwise and C is therefore clockwise.


