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The graphic on the right shows the Arigna Mining Experience Centre in Co - Leaving Cert DCG - Question C-3 - 2012
Question C-3
The graphic on the right shows the Arigna Mining Experience Centre in Co. Roscommon. The modern design of the angular building reflects its rugged surroundings. Fig... show full transcript
Worked Solution & Example Answer:The graphic on the right shows the Arigna Mining Experience Centre in Co - Leaving Cert DCG - Question C-3 - 2012
Step 1
Surfaces A and C have a pitch of 60° and surfaces B and D have a pitch of 40°. Draw the elevation and plan of surfaces A, B, C and D.
Answer
To begin, draw the outline plan of the surfaces according to the given dimensions.
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Outline Plan: Create a horizontal rectangle representing the base of the building, using the dimensions for surfaces A, B, C, and D. Ensure surfaces A and C are sloped at 60°, indicating a steep roof pitch, while surfaces B and D slope at 40°.
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Elevation: For the elevation view, project the slope lines from the outline plan, ensuring that the angles are correctly represented. Surface A will rise at a 60° angle, while surfaces B and D should reflect their respective 40° angles.
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Complete Plans and Elevations: Label all surfaces clearly and ensure lines are accurate and proportionate to the scale of 1:100.
Step 2
Draw the elevation and plan of the dormer window E and determine the dihedral angle between the surfaces B and E.
Answer
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Elevation and Plan of Dormer Window E: Start by drawing the dormer window E in elevation first, ensuring it is aligned correctly with the main building surfaces B and D. Represent window E with a rectangular shape at the designated elevation height.
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Dihedral Angle: To determine the dihedral angle between surfaces B and E, measure the angle at which these two surfaces intersect. This can be achieved by using the tangent lines of both surfaces at their intersection point.
Step 3
Develop the surface E.
Answer
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Construction to Determine True Shape: Begin the development by laying out surface E in its true shape, considering the dimensions and pitch. Mark out the heights and angles while keeping in mind the shape will be triangulated.
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Draw Required Development: Finally, unfold surface E on paper, ensuring all edges and vertices are marked accurately to represent the true dimensions.
Step 4
The dihedral angle between surfaces D and F is 120°. Complete the projections of the structure.
Answer
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Drawing the Dormer Window E: Reference the plan and elevation of dormer window E, ensuring it fits within the existing structure plans of surfaces B and D.
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Projection Completion: For surfaces D and F, depict the angle of 120° within your drawing framework. Ensure all surface projections align appropriately with existing surfaces and incorporate the dihedral angle measurement accurately to maintain the design's integrity.