1. Basic Principles and Generation of Layer Information Andrea, Emilia, Sofie, Stephanie Rapid Prototyping 25.10.2012

2. Basic Principles of Rapid Prototyping Processes A generative production process Layers 2½ D Directly from computer data

3. Generation of the mathematical layer information Generation of the physical layer model

4. The principle of model generation by rapid prototyping

5. Generation of Layer Information Description of the geometry by a 3D data record Generation of the geometrical information of each layer Projection of the geometrical layer information of each layer

6. Description of the geometry by a 3D data record Data flow

8. Modeling 3D-bodies in 3D-CAD CAD-Model -Component Geometry -Materials -Surface quality -Production Process -… and much more

9. CAD Model types

10. Basic Solids

11. Surface determinating models

12. Hybrid models

13. Design Systematics of 3D-CAD

14. Common Mistakes Surface Model The normal vector needs to point out of the component

15. Common Mistakes Surface Model Gaps between surfaces

16. Demands on CAD systems Some requirements, on the CAD system, should be taken into consideration to realization the principle of simultaneous engineering.

17. Considerable requirements Parametric 3D designs Hybrid models Continuous database Redundancy avoidance Open system Associativity

18. Reverse engineering Reverse engineering takes an already existing product and re- defines it into a workable model.

21. Advantageous measurement The measurement of an existing geometry is advantageous if one or more of the following work steps dominate the design: Making of mirror-symmetrical CAD models from hand models that are never exactly symmetrical Making of mirror symmetrical CAD models from semi models. Introduction of additional geometries such as grooves or drillings in complex components. Alterations of the model to enable variations to be probed on the screen, for example. Isolation of one element of a group of components as a basis for further construction work.

22. Measured Data Logging

24. Complexity of single geometry Are these surfaces geometric basic bodies such as, for example, cubes or cylinders? How large is their proportion? Do the surfaces join each other only evenly or also unevenly? Do the surfaces meet at obtuse-angled or acute-angled joints? If the degree of complexity of all single geometrics is extremely low then the resulting complete model will also possess a low degree of complexity. Such bodies could also be measured completely in the conventional manner.

25. Generation of Geometrical Layer Information on Single Layers Slicing - STL - SLC

26. STL Format

27. Practical advantages (STL) Easy to solve syntax errors Higher quality of geometric information Permit any desired scale without reversing into the CAD

28. SLC Format

29. Projection of Geometrical Layer Information on the Layer Vector Raster Mask processes

30. Questions?