The 3D graphic on the right shows a Data Projector which is often mounted on the ceiling in a DCG classroom - Leaving Cert DCG - Question C-5 - 2010

To create the sectional elevation A-A of the assembled mounting bracket, follow these detailed steps:

1. Start with the base layout: Begin by sketching the overall outline of the mounting bracket according to the provided dimensions. Ensure that the proportions maintain a 1:1 scale as noted in the scale reference.

2. Incorporate the fixing plate and the mounting bracket details: Carefully depict the fixing plate on the mounting bracket, marking the position for the connecting pin and other details. Ensure that the dimensions, particularly for holes and cuts, reflect the information from Fig. C-5.

3. Draw the sectional view A-A: This involves slicing through the mounting bracket as indicated and illustrating the internal features. Include the nuts and bolts in the correct positions, ensuring clarity for assembly.

4. Dimensioning: Add relevant dimensions to your drawing that align with the specific measurements illustrated in Fig. C-5. This includes diameters of holes and lengths of bolts.

5. Finishing touches: Ensure that all parts are labeled correctly, and the drawing is clear and easy to interpret. Follow standards for technical illustration and ensure any omitted dimensions are estimated logically and indicated in the notes of the drawing.