![]() The second is to take physical measurements, or through a CMM or scanning process, and make an electronic model that in turn can be machined, or printed through one of the many rapid prototyping technologies. This process is outside the scope of this discussion. One is to use a process to make a mold of the original and make castings using the mold. There are two primary ways to duplicate a part. Close inspection and comparison will always find small differences because of the processes used and decisions made by the skilled operator. In both of these cases, it is not possible nor realistic to think that reverse engineered part will produce an identical replacement. The key is to make an accurate model of what the original might have looked like before it was worn or damaged. In this situation, the model will not precisely follow the original, in order to compensate for the wear and damage to the original. When creating a new model, working from a typical example, of something that is worn or damaged, and needs to be replaced, the person doing the work needs to have a good understanding of the original part and the circumstances of its use. The key is preserving the detail and accuracy from the original example. This might be done for historical preservation or restoration, to mass-produce a unique object like a special wood carving, or to model a damaged knee joint for a prosthetic replacement, for example. When making physical duplicate, the goal is to model as accurately as possible, preserving the odd nature and special features of the object. The two primary reasons for doing this are to make duplicates for reproduction and to make replacement parts. For our purposes, we will define reverse engineering as taking an existing object and using some process to make more. Part of this confusion is from the misinformation passing between well-intentioned users and part is from the overly general nature of the questions asked. Reverse Engineering A Short Discussion There is a lot of confusion about scanning. More information on the NextEngine scanner can be found at: Use the cleaned up mesh as a basis for making a smooth, accurate, NURBS model, suitable for any down-stream manufacturing process. A scan from the NextEngine Desktop Scanner is used as the example. iiģ 1 Introduction This document shows how to do two things: Bring the meshes into Rhino and clean them up, making them suitable for rapid prototype (STL) printing as a single, closed mesh. Copyright 2006 Robert McNeel & Associates. Rhinoceros is a registered trademark and Rhino is a trademark of Robert McNeel & Associates. 1 Using Rhinoceros Scan, Cleanup, and RemodelĢ Copyright 2006 Robert McNeel & Associates. ![]()
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