The graphic on the right shows a cam which forms part of a quick release mechanism for a bicycle wheel - Leaving Cert DCG - Question C-4 - 2012
Question C-4
The graphic on the right shows a cam which forms part of a quick release mechanism for a bicycle wheel.
A similar cam imparts this motion to a follower:
- 0° to 90... show full transcript
Worked Solution & Example Answer:The graphic on the right shows a cam which forms part of a quick release mechanism for a bicycle wheel - Leaving Cert DCG - Question C-4 - 2012
Step 1
Draw the given plan
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Answer
To begin with, sketch the given plan of the cylinder at the bottom. Ensure that the dimensions match those provided in the elevation and plan figures.
Step 2
Draw the outline elevation
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Answer
Next, draw the elevation of the cylinder by outlining the circular base and the top, marking point A at the bottom (0 height) and point B at the top (120 height) accurately.
Step 3
Complete division of plan
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In the plan view, divide the circumference into equal parts to represent the revolutions of the helix leading from point A to B.
Step 4
Complete horizontal divisions in elevation
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Complete the horizontal divisions in the elevation drawing by marking equal intervals vertically to correspond with the divisions made in the plan view.
Step 5
Complete projections from plan of helix
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From the plan, extend vertical lines down to the elevation to display the paths that correspond to the helix projection.
Step 6
Locate points in elevation
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Locate and mark the positions of key points that align with the projections from the plan to ensure a proper representation.
Step 7
Draw the helix in elevation
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Finally, sketch the helix in the elevation by connecting the located points in a smooth, spiral motion from point A at the bottom to point B at the top.
Step 8
Complete Displacement Diagram
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Answer
Compile the previous steps into a single comprehensive displacement diagram, making sure the flow and transitions between sections are clear and visually aligned.
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