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The image below shows a sign outside the offices of a company called 'Key Technologies' - Leaving Cert DCG - Question A-3 - 2013
Question A-3
The image below shows a sign outside the offices of a company called 'Key Technologies'. In the sign, a truncated copper pyramid is intersected by a triangular steel... show full transcript
Worked Solution & Example Answer:The image below shows a sign outside the offices of a company called 'Key Technologies' - Leaving Cert DCG - Question A-3 - 2013
Step 1
Complete the plan, showing all lines of interpretation.
Answer
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Location of penetration points on RHS in plan:
- Identify and mark the points where the triangular prism intersects the copper pyramid on the right-hand side in the plan.
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Joining of points on RHS in plan, incl. hidden detail:
- Connect the identified points with appropriate line types to represent the edges of the solids, including hidden lines to indicate any obscured edges.
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Location of penetration points on LHS and top in plan:
- Mark the intersection points on the left-hand side and the top view, maintaining consistency with the right-hand side.
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Draw required section in elevation:
- Create a section view that accurately reflects how the solids intersect in the elevation view.
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Draw corresponding section in plan to locate "crossover points" on edge 'de':
- Project the section through 'de' in the elevation to find the corresponding crossover points in the plan view.
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Joining of points on LHS and top in plan, incl. hidden detail:
- Similar to the RHS, join the identified points on the left-hand side and top view with appropriate line conventions, including hidden lines.
Step 2
Determine the true shape of the triangle abc.
Answer
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Rabatment of triangle in elevation or line in plan (for correct use of X, Y):
- Construct the rabatment using lines from points A, B, and C to transfer their true shape onto a suitable plane, ensuring to reference the original positions accurately.
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Correct use of projection lines:
- Use projection lines effectively to ensure all dimensions and relative positions are accurate when determining the true shape.
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Determination of required true shape:
- Analyze the configuration of points a, b, and c and present the true shape of the triangle clearly with dimensions marked, showing the relation between the projected points.