1. Rapid Prototyping Methods

2. From Marking Schemes

3. Laser Object Modelling
Layer fabrication starts with sheet being adhered to substrate with the heated roller.
The laser then traces out the outline of the layer.
Non-part areas are cross-hatched to facilitate removal of waste material.
Once the laser cutting is complete, the platform moves down and out of the way so that fresh sheet material can be rolled into position.
Once new material is in position, the platform moves back up to one layer below its previous position.
The process can now be repeated.

4. Stereo Lithography
The 3D computer based component design is divided into 0.25mm thick layers.
The laser is then scanned onto the surface of the monomer resin, drawing the cross section of the component.
Once this resin is cured, the platform drops 0.25mm into a vat filled with monomer.
The liquid monomer flows over the layer and the second layer is scanned.
The procedure is repeated until the part is finished.

5. Selective laser sintering
Like Steriolithography Selective laser sintering
uses a laser beam to selectively fuse powdered materials, such as nylon, elastomer, and metal, into a solid object
Parts are built upon a platform which sits just below the surface in a bin of the heat-fusable powder.
A laser traces the pattern of the first layer, sintering it together.
The platform is lowered by the height of the next layer and powder is reapplied.
This process continues until the part is complete.

6. Solid Ground Curing For each layer, a photomask is produced
Next, the photomask is positioned over the work surface and a powerful UV lamp hardens the exposed photosensitive resin:

7. Homework for
Remember (at least) 2 advantages and 2 disadvantages of the i.e.
Plastic Additives given by
Laser Object Modeling Click Link for process description
Solid Ground Curing Click Link for process description
Stereo Lithography Click Link for process description
Selective laser sintering Click Link for process description
Video Laser Object Modeling Click Link for Video of process
Video Laser Sintering Process (SLS) Click Link for Video of process
Video Stereo Lithography Click Link for Video of process
Video Solid Ground Curing Click Link for Video of process
And
Also
Finish Hand-out given in lesson on economic factors