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The 3D graphic on the right shows a design for a referee's whistle - Leaving Cert DCG - Question C-3 - 2011
Question C-3
The 3D graphic on the right shows a design for a referee's whistle. The plan and elevation of the whistle are shown in Fig. C-3. (a) Draw the given views. (b) Dra... show full transcript
Worked Solution & Example Answer:The 3D graphic on the right shows a design for a referee's whistle - Leaving Cert DCG - Question C-3 - 2011
Step 1
Draw elevation
Answer
To draw the elevation of the whistle, start by identifying the main features visible from the elevation view. Begin by sketching the vertical profile, noting the height and the curvature called for by the R25 radius. Accurately depict the rectangular body and the whistle’s mouth. Ensure to label the drawn elevation clearly.
Step 2
Outline plan
Answer
The outline plan should be drawn from a top-down perspective. Begin with the overall width (70 mm) and depth (15 mm) as shown in the drawing. Add the circular section with a radius of R25 for the end view of the whistle. Clearly indicate any openings or features as seen from this perspective.
Step 3
Complete the plan
Answer
In completing the plan, ensure that both views (elevation and outline) are correctly aligned. Include any additional dimensions for clarity, especially where the elevation intersects with the plan (such as the curved parts). Finalize the drawing by adding necessary construction lines and ensuring everything remains to scale.
Step 4
Draw a one-piece surface development of the whistle
Answer
To create the one-piece surface development, start by calculating the required dimensions based on the completed elevation and outline. This includes:
- Development of top surface: Identify the dimensions of the flat areas and curves.
- Division of circumference: For the circular segments, calculate the circumference using the formula: where R = 25 mm.
- Development of curved surface: Unroll the curved sections into flat shapes, ensuring appropriate angles are maintained.
- Development of vertical surface: Extend the vertical sections out flat, keeping dimensions aligned.
- Compliance with triangular surfaces: Include any triangular surfaces and their respective measurements.
- Presentation: Make sure the final development is clear, well-labeled, and meets presentation standards, keeping lines clean and distinguishing between different surfaces.