The 3D graphic on the right shows a phone holder for a bicycle - Leaving Cert DCG - Question C-5 - 2020
Question C-5
The 3D graphic on the right shows a phone holder for a bicycle.
The details of the holder are given in Fig. C-5 below.
The parts list is also given in a table. The s... show full transcript
Worked Solution & Example Answer:The 3D graphic on the right shows a phone holder for a bicycle - Leaving Cert DCG - Question C-5 - 2020
Step 1
Relative positioning of components
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To determine the relative position of the components, begin with the lower bracket as the base. The other components should be positioned in relation to this base, taking into account their respective dimensions and orientations as provided in the figure. The swivel mount connects above the lower bracket, serving as a pivot point for the swivel arm, which extends out at a 45-degree angle.
Step 2
Outline of Lower Bracket
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The lower bracket can be outlined based on the dimensions from the figure. The shape is predominantly rectangular with rounded ends. The overall dimensions provide a solid base for the phone holder assembly.
Step 3
Tangential portion of Lower Bracket
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A tangential portion should be added, which connects smoothly with the circular part referenced in the design. This ensures that any loading on the bracket will distribute evenly without stress concentration.
Step 4
Outline of Top Bracket
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The top bracket’s outline should mimic that of the lower bracket but with dimensions that complement the design while ensuring a secure fit around the phone holder. Draw this component such that it aligns with the swivel mount.
Step 5
Curves in Top Bracket
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The curves within the top bracket should be drawn to maintain aesthetic and functional aspects as noted in the figure. Ensure the radii are consistent with the listed dimensions.
Step 6
Cylindrical Bar in Top Bracket
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A cylindrical bar should extend from the top bracket to support the swivel mount. Highlight this feature clearly to indicate its role in connecting components.
Step 7
Outline of Swivel Mount
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The outline of the swivel mount must depict the necessary details, including any holes or cutouts intended for securing the swivel arm.
Step 8
Inner Detail of Swivel Arm
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Inner details of the swivel arm include any features or assemblies that aid in functionality, such as grooves or attachment points for the arm spindle.
Step 9
Outline of Swivel Arm
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Provide a clean outline that represents how the swivel arm would function in connection with the swivel mount, including any necessary supports or connectors.
Step 10
Inner Detail of Swivel Arm
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This section should include any further details required to understand how the arm functions, including any locking mechanisms or adjustment features.
Step 11
Outline of Phone Holder Body
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The phone holder body should be outlined to depict its shape accurately. It needs to integrate well with the assembled components.
Step 12
Inner Detail of Phone Holder Body
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Inner details of the phone holder body should illustrate how it accommodates the phone, including any padding or protective mechanisms.
Step 13
Outline of Cam Lever Lock
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The outline for the cam lever lock should reflect its functional aspect, clearly showing how it locks in place when required.
Step 14
Inner Detail of Cam Lever Lock
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Draw the inner mechanisms that allow the cam lever lock to engage effectively, ensuring clarity in the operation of the lock.
Step 15
Cam Lever Spindle
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The cam lever spindle should be detailed to show how it interacts with the cam lever lock, providing necessary support for operation.
Step 16
Completion of drawing
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Ensure that the final drawing is neat, with appropriate hatching to indicate different material sections and clear centerlines to enhance readability and understanding. Maintain a consistent scale, and ensure all components are well-defined and properly labeled.
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