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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 ?

GEAR A

GEAR B

GEAR C

20 TEETH

60 TEETH

10 TEETH

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 anti-clockwise and C is therefore clockwise.

 

 

 

     

  Gear A revolves at 90revs/min. What is the output and direction at Gear C.

 

GEAR A

GEAR B

GEAR C

30 TEETH

90 TEETH

15 TEETH

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 anti-clockwise and C is therefore clockwise.

 

 
 

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