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CAM TOY EXERCISE
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Below is a mechanical toy based on a CAM mechanism. As the handle on the eccentric cam is turned the top part of the egg shell lifts to reveal a face. The basic construction of the toy is also shown below. The ‘flat’ follower moves upwards and downwards as the cam rotates. Although the design is simple it must be made accurately or the mechanism will stick. (Look at common faults sheet).

   
 
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Two similar examples are shown below. However, each one has a different cam profile.

 

A ‘drop cam’ has been used on the toy below. The movement is different compared to the smooth motion of the eccentric cam. As the cam rotates the top half of the shell lifts at a relatively constant speed and then drops down suddenly.

 

The ‘pear shaped’ cam also has a different motion. The pear shaped cam lifts up the top part of the shell quite quickly and then it drops down just as quickly. However, for half a revolution the shell does not move at all.

 

     
 

 

   

QUESTION:

You are to design a toy based on the operation of a CAM mechanism. As the cam rotates the follower moves upwards and then returns to its original position.

1. Design the front, moving part and background for two toys.

2. Label the CAM, FOLLOWER and other parts.

3. Add notes that explain how each idea works

 

Using the design template / worksheet shown below or a similar one, design TWO cam based toys. Include notes to help explain how each one works. (Follow the links at the top of the page for the design template / worksheet)

 

 
 
 

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