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C-5. Details of a Desk Monitor Stand are shown in Fig - Leaving Cert DCG - Question C-5 - 2017
Question C-5
C-5. Details of a Desk Monitor Stand are shown in Fig. C-5. The parts is given below together with a partially exploded 3D graphic of the stand and its constituent p... show full transcript
Worked Solution & Example Answer:C-5. Details of a Desk Monitor Stand are shown in Fig - Leaving Cert DCG - Question C-5 - 2017
Step 1
Draw a full-size sectional elevation on A-A, showing the parts fully assembled, with the Parallel Arms horizontal and the LCD Mount Bracket vertical.
Answer
- Preparation: Start by setting up your drawing area with proper dimensions, ensuring you use the correct scale.
- Base: Draw the outline of the base as indicated, making sure to include the cylindrical sections. Illustrate the overall form and ensure the base is clear.
- Vertical Hinge Post: Create two vertical hinge posts as displayed in the diagram, paying attention to angles and dimensions.
- Parallel Arms: Draw the Parallel Arms extending horizontally, ensuring the correct orientation and connection to the hinge posts. Include circular details and intersections precisely.
- Top Cranked Arm: Incorporate the top cranked arm by sketching it with the right measurements and angles as illustrated.
- LCD Mount Bracket: Add the LCD mount bracket showing all sections, ensuring that the components align correctly with the arms and post.
- Additional Details: Include fillets and reliefs as needed for all parts. Annotate any additional details where necessary, making sure each part is identifiable.
- Final Touches: Ensure the drawing is clear with proper hatching. Review the entire drawing for completeness and accuracy.
Step 2
On your drawing determine the maximum rotation angle of the Parallel Arms as they rotate upwards about the left hand Parallel Arm Pins.
Answer
- Determine Internal Tangent: Start by identifying the internal tangent line from the axis of rotation to the end of the arms. Use geometric principles to find this angle, which is crucial for understanding rotation.
- Arm Length: Measure the distance from the rotation point to the end of the Parallel Arms, referred to as 'arm length'. This will serve as a critical reference for rotation calculations.
- Horizontal Travel Calculation: Using the geometric properties of the parallelogram formed by the arms, apply trigonometric functions to calculate the maximum horizontal travel of the LCD Mount Bracket. The formula used will be: where is the horizontal distance moved, is the length of the arms, and is the maximum rotation angle. Make sure to express your findings clearly.