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The graphic below shows various images of the Orbit Tower which is located in London's Olympic Village - Leaving Cert DCG - Question C-4 - 2018
Question C-4
The graphic below shows various images of the Orbit Tower which is located in London's Olympic Village. At over 100m in height, it is the UK's tallest sculpture and ... show full transcript
Worked Solution & Example Answer:The graphic below shows various images of the Orbit Tower which is located in London's Olympic Village - Leaving Cert DCG - Question C-4 - 2018
Step 1
Draw the plan and elevation of the cylinder.
Answer
To draw the plan and elevation of the cylinder, start by sketching a circle to represent the base of the cylinder in the plan view. This circle should be drawn to scale, using an appropriate radius to represent the cylinder's dimensions.
Next, for the elevation, draw a rectangle representing the height of the cylinder, ensuring that the width is consistent with the circle drawn in the plan. The two diagrams should clearly align, with the base of the elevation corresponding to the base of the plan.
Step 2
Complete the projections of a regular helix which moves in a clockwise direction about the cylinder, from point A at the base, to point B at the top, in one revolution.
Answer
To complete the projections of the helix:
- From point A at the base of the cylinder, plot points along the circle at intervals that reflect the rise. For one complete revolution, ensure you maintain an even spacing.
- Draw a smooth curve connecting these points, ensuring that the curve spirals upwards as it wraps around the cylinder.
- Label the endpoint at the top of the cylinder as point B. This projection illustrates the height gained after one complete turn around the cylinder.
Step 3
Draw the displacement diagram for a cam.
Answer
Start by setting up a horizontal axis to represent the angular displacement in degrees. Divide this axis into sections:
- 0° to 120°: Represent a rise of 70mm with a uniform velocity. Draw a straight line from the base up to 70mm in height at 120°.
- 120° to 180°: Indicate a fall of 22mm. This will be a vertical line descending from the 70mm mark to 48mm at 180°.
- 180° to 360°: For the uniform acceleration and retardation, create a curve that gradually rises to 70mm and then tapers off as it comes back down to the original baseline at 360°.
Ensure that each segment is clearly labeled and appropriately spaced to indicate the relative motion of the cam.