Rapid Prototyping

Definition

"The speedy fabrication of sample parts for demonstration, evaluation, or testing. It typically utilizes advanced layer manufacturing technologies that can quickly generate complex three-dimensional objects directly from computer-based models devised by Computer Aided Design (CAD). This computer representation is sliced into two-dimensional layers, whose descriptions are sent to the fabrication equipment to build the part layer by layer. Rapid prototyping includes many different fabrication technologies. Stereolithography (SL), selective laser sintering (SLS), laminated object manufacturing (LOM), and fused deposition modeling (FDM) are a few examples." (http://www.csa.com/discoveryguides/rapidman/gloss.php)

Methodology

"Methodology of Rapid Prototyping

The basic methodology for all current rapid prototyping techniques can be summarized as follows:

1. A CAD model is constructed, then converted to STL format. The resolution can be set to minimize stair stepping.

2. The RP machine processes the .STL file by creating sliced layers of the model.

3. The first layer of the physical model is created. The model is then lowered by the thickness of the next layer, and the process is repeated until completion of the model.

4. The model and any supports are removed. The surface of the model is then finished and cleaned." (http://efunda.com/processes/rapid_prototyping/intro.cfm_

Techniques

Stereolithography (SLA), Selective Laser Sintering (SLS), Laminated Object Manufacturing (LOM), Fused Deposition Modeling (FDM), Solid Ground Curing (SGC), and Ink Jet printing techniques.

Example

See the Desktop Factory at http://www.desktopfactory.com/

More Information

See our entries on Personal Fabricators, Desktop Manufacturing and Rapid Manufacturing

New York Times Report, "Beam It Down From the Web, Scotty", at http://www.nytimes.com/2007/05/07/technology/07copy.html?