It is known that prototyping is part of the cycle of pre-production products: check of the collection, appearance, efficiency of future products, especially if it will have massive circulations. All these problems are solved by manufacturing a prototype.
Number of prototyping technology in the market is rather large. They vary according to the principles of building a prototype, used materials date and cost. It is difficult to understand this diversity for a person, who does not use prototyping daily.
Often time spent searching for the right option, is greater than the time of manufacture of the prototype.
Modeling of the surface of industrial products on the computer can be done the two main methods. This is spline modeling and polygonal modeling.
It is quite possible to compare the difference between these techniques with the difference between vector and raster images. You can increase / decrease the first one in a very large extent, the quality of the lines does not change - in fact all the lines are the mathematical formulas. They can be scaled without fear to get jagged (pixel) edges, like when increasing an ordinary computer image.
Therefore, spline modeling - is modeling by mathematically sleek lines - splines. Polygonal modeling - is alignment of angles, vertices of polygons in three-dimensional space. In this case, needed smooth is got by increase the number of lines (flat) sections. There are operations of anti-aliasing (smooth) vertices, so the result of the polygonal method may look smooth too, but to achieve high accuracy surface in reality is difficult.
Splines and polygons.
In the first case splines are described only by the scope of isoperimetric curves on the equator of the ball. Such a surface can be scaled and made with any necessary accuracy, precision setting the stage of prototyping.
Thus, if you want to get predictable guaranteed a smooth and accurate result in the manufacture of industrial products, the simulation of surfaces must be with splines.
There are two most common file formats for storage of computer models of surfaces: spline surfaces are saved in IGES format, polygonal ones in a format STL. It was last used in most prototyping systems of laminate synthesis. However, if it is possible to transfer IGES to STL, then it is impossible to make the correct conversion in the opposite direction. You should also take into account the fact that not all surfaces require the same degree of accuracy of translation. So, round areas should be “coarsened” as accurate as possible, but it is enough pair of describing vertices for flat sections.
Another problem is the requirement of different methods of prototyping the different minimum wall thickness for handling stocks, etc. Of course, it is good if your model already contains information about the thicknesses and radii, but if prototyping device has tougher possible step than your radius of curvature, then "nodules," "rounding" or "slices" will appear on the corners in comparison with the theoretical (computer) model.
Over the recent decades rapid prototyping services managed with solving lots of tech problems happening when trying to show a product, design or model. Have you ever faced such a problem too? Then you are welcomed to check out a rapid prototyping methodology site.
And don't forget that we are living in the world of digital technologies. Bear in mind that modern web technologies offer you a unique chance to try and to find anything you might want. Make use of them to search for cheap rapid prototyping. If you want to keep abreast of new publications on the topic subscribe to the RSS feed on this blog.
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