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SYSTEMS PREPARATION QUESTIONS 2008 - 4
 
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A second version of the clown model has been manufactured (see previous question). This is mechanically operated by a rotating device.
 
 
Draw the mechanical device on the diagram above
 
ANSWER
 
 
 
 
What is the function of the pivot ?
 
 
 
 
 
ANSWER
 
The pivot allows the barrier to rotate at a specific point. In this case the barrier rotates upwards and downwards about the pivot.
 
Name the device and explain how it works.
 
DEVICE NAME: _________________________________________
 
How it works:
 
 
 
 
 
ANSWERS
 
DEVICE NAME: Eccentric Cam
 
How it works:
 
As the eccentric cam rotates in a clockwise direction the barrier is pushed upwards at a constant rate. It then descends at a constant rate back to its original position.
 
What is the function of the spring ?
 
ANSWER
 
What is the function of the spring ?
 
The spring returns the arms to a level position when the eccentric cam has dropped to its lowest position. It also helps ensure that the motion of the entire mechanism is smooth.
 
 
 
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