SYSTEMS PREPARATION QUESTIONS 2008 - 4
V. Ryan © 2008
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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. |
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| Draw the mechanical device on the diagram above | ||
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ANSWER |
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What is the function of the pivot ? |
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ANSWER |
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The pivot allows the barrier to rotate at a specific point. In this case the barrier rotates upwards and downwards about the pivot. |
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| Name the device and explain how it works. | ||
| DEVICE NAME: _________________________________________ | ||
| How it works; | ||
| ANSWERS | ||
| DEVICE NAME: Eccentric Cam | ||
| How it works: | ||
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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. |
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| What is the function of the spring ? | ||
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ANSWER |
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| What is the function of the spring ? | ||
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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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