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The image on the right shows a watch - Leaving Cert DCG - Question C.3 - 2020
Question C.3
The image on the right shows a watch. The design includes transition pieces connecting an octagonal base to a square watch face. Fig. C-3 shows the elevation, plan ... show full transcript
Worked Solution & Example Answer:The image on the right shows a watch - Leaving Cert DCG - Question C.3 - 2020
Step 1
Draw the given end view and project the plan and elevation.
Answer
To draw the given end view, first replicate the provided view directly onto your drawing medium. Ensure to maintain proportions and angles as depicted in the figure.
For the plan, project the outlines of the watch face and base as represented in the end view calculations.
To draw the elevation, ensure to correctly project the lengths and heights from your plan view, accurately reflecting the nuances of the watch's design.
Step 2
Determine the dihedral angle between surfaces A and B.
Answer
Identify the line of intersection between surfaces A and B on the new reference line XY. Use the principles of geometry to determine the dihedral angle, noting that the angle formed with respect to this line will give you the angle required. The angle can be calculated using trigonometric functions based on the measurements obtained from the projected views.
Step 3
Determine the surface development of surfaces A, B and C.
Answer
To find the surface development of surfaces A, B, and C:
- For surface A, determine the true shape using the dimensions provided, ensuring the flat pattern can be unfolded accurately.
- For surface B, calculate the shape by assessing the angles formed from the projections.
- For surface C, similarly break down the complex geometry to reveal its true surface development.
Step 4
Draw the hands on surface C in the development view and also in elevation and plan.
Answer
Begin by sketching the hour and minute hands on the surface C development as per specifications. Ensure the proportions of the hands in relation to the watch face are accurately represented.
For elevation, project the height and width of the hands from the development view. Similarly, for the plan view, represent the top-down view of the hands, ensuring they align with the previously drawn watch face components.