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1.
A student is using CAD software to create a 3D model of a new product. They need to present this model to a client. Describe three different methods the student could use to present the 3D model to the client, and discuss the advantages and disadvantages of each method.
There are several ways to present a 3D CAD model to a client. Here are three common methods, along with their pros and cons:
| Method | Advantages | Disadvantages |
| Interactive 3D Viewer (e.g., online viewer, software plugin) | Allows the client to explore the model freely, rotate, zoom, and view different perspectives. Can be accessed remotely. | Requires a stable internet connection for online viewers. May not fully replicate the look and feel of the original CAD software. |
| 3D Printed Prototype | Provides a physical representation of the product, allowing the client to assess its size, shape, and form. | Can be expensive, especially for complex designs. May require multiple iterations to achieve the desired result. |
| Rendered Images and Animations | Creates photorealistic images and animations of the product, showcasing its appearance and functionality. Can be used for marketing and presentation purposes. | May not accurately represent the product's physical properties. Requires time and expertise to create high-quality renders. |
The best method depends on the client's needs and the stage of the design process. For early concept stages, rendered images and animations might be sufficient. For later stages, a 3D printed prototype or an interactive 3D viewer would be more appropriate.
2.
Question 3
A student is creating a set of technical drawings for a simple wooden box. They need to accurately communicate the dimensions and features of the box to a carpenter.
(a) Describe the different views that would typically be included in an orthographic projection of a wooden box.
(b) Explain how dimension lines are used in technical drawings to indicate the size of features.
(c) A student has drawn a freehand sketch of a complex machine component. What are the potential problems with using only a freehand sketch to communicate the design to someone else? Suggest two ways the student could improve the clarity and accuracy of the communication.
(a) An orthographic projection of a wooden box would typically include:
- Front View: A view looking directly at the front of the box.
- Top View: A view looking down on the top of the box.
- Side View: A view looking at the side of the box.
- Section View (optional): A view cut through the box to show internal details.
(b) Dimension lines are used in technical drawings to indicate the size of features. They consist of a horizontal line with arrowheads at each end, and two parallel lines pointing towards the feature being dimensioned. The distance between the parallel lines indicates the dimension, and the arrowheads indicate the extent of the dimension.
(c) Potential problems with using only a freehand sketch:
- Lack of accuracy: Freehand sketches often lack precise dimensions and proportions, making it difficult to accurately replicate the design.
- Ambiguity: The sketch may not clearly communicate all the necessary details, leading to misinterpretations.
Two ways to improve clarity and accuracy:
- Use orthographic projection: Create accurate front, top, and side views to clearly define the dimensions and features.
- Add dimensions: Include dimension lines with appropriate measurements to specify the size of all components.
3.
Question 2
A design student has created a prototype of a new kitchen appliance. They need to prepare a set of technical drawings for a potential investor. Explain how the use of different scales in drawings (e.g., 1:10, 1:20) can affect the information conveyed and the overall effectiveness of the technical drawings. Provide examples of when a larger and a smaller scale might be appropriate.
The scale of a drawing determines the relationship between the size of the object and the size of the drawing on the paper. A smaller scale (e.g., 1:10) means that a smaller dimension of the object is represented by a larger dimension on the drawing. Conversely, a larger scale (e.g., 1:20) means a smaller dimension is represented by a smaller dimension on the drawing.
Larger scales (e.g., 1:10) are appropriate when detail is important and accuracy is paramount. They are used for drawings where precise measurements and dimensions are critical, such as detailed parts drawings or drawings of small components. A larger scale allows for the accurate representation of fine details and makes it easier to read dimensions.
Smaller scales (e.g., 1:20) are suitable for drawings where the overall layout and relationship between parts are more important than precise dimensions. They are often used for plans or drawings of larger assemblies. A smaller scale allows for a more compact representation of the object, making it easier to fit all the components on a single sheet of paper. It's also useful for showing the overall proportions and spatial relationships.
For an investor presentation, a scale of 1:20 might be appropriate for a general overview of the appliance, showing its overall form and how the different components relate to each other. Detailed drawings of specific components, however, would require a larger scale like 1:10 to show the necessary detail.