Modelling and Prototyping
In this section you will need to explain the processes, application advantages and disadvantages of the following processes:
- Block Modelling
- Rapid Prototyping using CAD/CAM
- Computer Modelling using photorealistic images and 'Virtual' products using wireframe, surface modelling and solid modelling
- Block Modelling
- Rapid Prototyping using CAD/CAM
- Computer Modelling using photorealistic images and 'Virtual' products using wireframe, surface modelling and solid modelling
Block Modelling
Shaping 3d forms from a pice of solid material
Rapid Prototyping
Stereo lithography and 3d Printing
- very thin layers of liquid plastic made solid using laser
- very thin layers of liquid plastic made solid using laser
Task:
Using notes and sketches describe the process of rapid prototyping using Stereolithography
What are the advantages/disadvantages?
- A typical commercial STL RPT machine costs around £10k
- Reduces development time (and therefore money)
- Fast time to market as lead time reduced between conception and client sign-off
- Very complex shapes can be made straight from CAD
- Very accurate prototyping as computer data is replicated
- Reduces development time (and therefore money)
- Fast time to market as lead time reduced between conception and client sign-off
- Very complex shapes can be made straight from CAD
- Very accurate prototyping as computer data is replicated
Virtual Modelling
A 3d image (moving or stationary) can give a much better impression of a finished product or environment; discuss the advantages the advantages of a vitual walk through of a 'new build' using 3d virtual modelling.
Advantages
Decrease in time to design and develop a new product - saves developmnent costs
Can be tested and evaluated without actually being manufactured
Advantages
Decrease in time to design and develop a new product - saves developmnent costs
Can be tested and evaluated without actually being manufactured
Virtual tour
3D Modelling Techniques
When designing there are 3 main modelling techniques when using CAD:
- Wireframe
- Surface Model
- Solid Object
- Wireframe
- Surface Model
- Solid Object
Wireframe
Vector based showing a 'skeleton' or wires of the model, it is transparent so you can see all edges however to the untrained eye this could be confusing. Uses minimal computer memory so it is quick to respond. Work is often built using wireframe as it is very quick.
Surface Model
A surface or 'skin' is placed over the wireframe to give it a more 3d feel
Solid Model
A full digital representation of an object, rendered to look like it or with the property of the materials to act like it..... very slow to respond because of the complex data required.