Easy modification, accurate representation, and built product insights are the principle interests to consider when instituting a rapid prototyping process. While achieving those goals starts with an understanding of the approaches and the tools directly involved in making that process a reality, it also involves an understanding of the potential pitfalls and how to avoid them.
Rapid Prototyping (RP) can be defined as a group of techniques used to quickly fabricate a scale model of a part or assembly using three-dimensional computer aided design (CAD) data. It uses span tolerance testing, male model tooling, and even finished products as part of a larger assembly in cases of complex parts integration.
From small shops to multinational manufacturing interest, the reasons for utilizing rapid prototyping are as diverse as the companies and industries that leverage this process, but often includes:
- Increasing effective communication
- Decreasing development time
- Decreasing costly mistakes
- Minimizing tooling and engineering changes
- A CAD model is constructed, then converted to STL format where the resolution can be set to minimize stair-stepping.
- The rapid prototyping machine processes the STL file by creating sliced layers of the model.
- 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.
- The model and any supports are removed. The surface of the model is then finished and cleaned.
In both new and reverse engineered prototyping, tolerance accuracy is paramount, which can be problematic even with highly accurate machines. The pitfall for manufacturers and design shops is that it can be challenging to verify the dimensional tolerances as defined by the CAD design and that of the rapid prototyped model. This is where the latest 3D laser scanners can enable fast and accurate scans of original parts for developing the CAD design for the prototype and ensure that subsequent prototypes can be quickly scanned to ensure that it meets tolerances.
While rapid prototyping can require a significant learning curve, today’s laser scanners enable operators to get up to speed quickly. Ultimately, this shortens the prototyping as well as the eventual manufacturing process as it ensures greater accuracy, less scrap and faster production cycles that meet deadlines that have financial consequences.
James Rawstron is a Senior Marketing Specialist at Hexagon Manufacturing Intelligence North America, located in North Kingstown, Rhode Island. Rawstron has 20 years of marketing communications experience in the software, high tech, industrial, advanced manufacturing machinery and medical device markets. He has written numerous articles for B2B publications, including blogs for a variety of industries. Prior to joining Hexagon, Rawstron served as a web marketing professional at IBM and a Marketing Manager at Vector Software. He holds a Bachelor of Arts in English and European History from Union College of Schenectady, New York.