The image below shows a bar graph presentation on a paper flip chart - Leaving Cert DCG - Question A-2 - 2016
Question A-2
The image below shows a bar graph presentation on a paper flip chart. The drawing on the right shows the plan and incomplete elevation of a similar bar graph and fli... show full transcript
Worked Solution & Example Answer:The image below shows a bar graph presentation on a paper flip chart - Leaving Cert DCG - Question A-2 - 2016
Step 1
Projection of points to elevation
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Answer
To project points from the plan to elevation, identify the corresponding points on the flip chart. Each vertical bar in the plan corresponds to a point that can be projected upward to create the elevation.
Step 2
Location of points on diagonal AB in elevation
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Answer
Identify the diagonal AB in the elevation view by extending lines from points A and B horizontally and vertically. The intersection of these lines with the respective bar elevations provides the locations of points A and B.
Step 3
Location of top left hand points of "bars" in elevation
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Answer
Locate the top left points of each bar by marking the highest point on the vertical axis of each bar within the elevation. Connect these points accurately to reflect their elevation correctly.
Step 4
Location of top point on vertical axis in elevation
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Answer
Pinpoint the highest point amongst all bars on the vertical axis, which determines the maximum height represented in the elevation diagram. This will often be the furthest right point of the last bar.
Step 5
Completion of elevation
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Ensure that the entire elevation is neatly completed, connecting the appropriate points and ensuring that all bar heights are accurately represented according to their corresponding values from the plan.
Step 6
Rotation of AB in plan (or use of appropriate auxiliary view)
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To find the true inclination of diagonal AB, it is necessary to rotate line AB into a vertical plane, using an auxiliary view if needed. The angle of rotation can be visualized by drawing the necessary auxiliary lines.
Step 7
Correct determination of required true inclination
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Answer
Using the proper trigonometric relationships and the sine/cosine rules, calculate the true inclination of diagonal AB by measuring the angles formed between it and the horizontal plane in your auxiliary drawing.
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