December 18, 2006
Reverse Engineering With SolidWorks And Inventor
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by Jeff Rowe - Contributing Editor
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Reverse Engineering With SolidWorks And Inventor

Creative Dezign Concepts Inc. announced that DezignWorks V8.0, a feature-based reverse engineering (RE) software product, supports SolidWorks 2007 and Inventor R11. Engineers and designers use DezignWorks and SolidWorks or Inventor to capture data from existing parts directly within their respective design environments, maintaining the associativity so they can design better products faster and more accurately, speeding time to market.

Creative Dezign Concepts Inc. just introduced another industry first to DezignWorks V8.0. DezignWorks has the ability to capture data directly from a digitizer device to SolidWorks ScanTo3D. With DezignWorks patent-pending data collection method all the movement of the device is stored and can be reused again and again with out the need to re-digitize the model. During the digitizing procedure the data can be exported and used to compare the information to an existing model or imported back into SolidWorks to create a mesh with SolidWorks Scan to 3D. Additional new capabilities have been added for capturing 2D/3D points and saving the data to a file structure (.csv ) and reading the
data back into SolidWorks to compare multiple model data such as chassis suspension points. For a complete list take the DezignWorks Test Drive.

A SolidWorks Certified Gold Product, DezignWorks enables users to perform reverse engineering functions directly inside the SolidWorks interface and create feature based models utilizing digitizer devices such as Faro, Romer and MicroScribe. DezignWorks in conjunction with SolidWorks 2007 expands on the software’s legacy of ease of use, design power, and affordability by also providing users with comprehensive drawing tools and new productivity features that will speed the adoption of 3D design around the world. DezignWorks gives engineers the functionality to capture data from their existing part and create an intelligent feature based model, allowing the engineer to make changes
rapidly while preserving the associativity to the part. DezignWorks can be used in a part or an assembly.

“Engineers shouldn’t have to move between 2-3 different applications to finish a product design,” said Brian Houle, Partner Program manager for SolidWorks. “Integrating DezignWorks with SolidWorks means engineers can begin reverse engineering their existing parts directly within the SolidWorks environment. That saves time and helps manufacturers meet tight production deadlines. SolidWorks gives engineers the tools they need to work more efficiently. That is why SolidWorks leads the market for mainstream 3D mechanical design software.”

“SolidWorks is the standard for 3D mechanical design software,” said Houle. “Combining it with DezignWorks gives engineers the tools they need to do their jobs faster and better by performing reverse engineering functions inside SolidWorks, creating intelligent data that conforms to SolidWorks and allows engineers to make changes to the data. Complex shapes can be captured quickly and accurately. DezignWorks is the only product of its kind that has the ability to randomly move the digitizer across the surface of the part and store the movement of the digitizer device for immediate use or at a later determined time. New or existing data can be added and simply reloaded
into the database, automatically generating new data for Scan to 3D. Because of its depth of integration to the SolidWorks interface engineers are productive in a few hours.

A recent study estimated that 80% of new designs came from existing designs, usually an existing part. Utilizing DezignWorks a feature based product instead of a point cloud product gives the engineer the ability to capture the exact shape, even complex surfaces, directly inside the SolidWorks interface and then make changes rapidly to meet the needs of the new products and improve the design for the ever changing market needs. DezignWorks offers best- fit capabilities for lines, arcs, circles and splines. DezignWorks offers several utilities for curve editing such as maintaining minimum distance while capturing complex curves as well as spline uniformity tool.

Creative Dezign Concepts also announced that DezignWorks V8.0 now supports Autodesk Inventor 11. Creative Dezign Concepts demonstrated DezignWorks V8.0 for Inventor 11 last week at the 19th Annual Performance Racing Industry show in Orlando, FL. DezignWorks known as a solution for feature based reverse engineering for SolidWorks now brings its patent pending technology to Inventor 11 as an AutoDesk Inventor development partner.


Commentary By Jeffrey Rowe, Editor

Earlier this autumn I had some hands-on experience with DezignWorks and SolidWorks Office Premium 2007. I undertook the experience because in many peoples’ minds, reverse engineering is the illegal act of copying, in effect stealing, an original design, in this case a physical object. That old perception and definition is something I wanted to help dispel with a more positive image based on my experience.

Reverse engineering is a process for digitally reconstructing a physical part. This is significant because recent estimates are that up to 80% of new designs come from existing ones, usually from existing parts and assemblies. Reverse engineering is part of a larger scheme becoming known as digital shape sampling and processing (DSSP), involving several technologies that together bridge the physical and digital worlds.

Many potential users wrongly assume that reverse engineering technology is beyond their financial means. However, you might be pleasantly surprised to discover that it is available as an affordable desktop package to small- and medium-sized businesses. Depending on the scanning technology employed, you will find an entry-level price point in the $15,000-$20,000 range, and that includes all the hardware and software needed for getting started in reverse engineering.

Although there are several digitizing technologies available today (each having its own distinct advantages and disadvantages), I’ll focus on scanning with contacting (mechanical touch probe) feature-based instruments, because that’s what I had available to me. Regardless of the particular method chosen, scanning provides you with something to start with as a vital digital part of the overall reverse engineering process.

Feature-based scanning using a touch probe is a method where features of an object are scanned by physical contact. A mechanical touch probe, also known as a contacting digitizer, is a physical part contact device and method well-suited for prismatic objects, such as machined parts.

Touch probes, are typically very accurate over a wide measurement volume. There are contact digitizers that are positioned manually to yield a single measurement at a time, or may be scanned across a surface to produce a series of measurements. Contact instruments usually employ an articulated arm that allows for multiple degrees of freedom of movement. The position of each section of the arm is determined by encoders or potentiometers mounted in each joint.

Manually positioned devices can make it easier to get at areas of an object that can be difficult to digitize, such as small holes, narrow slots, or deep pockets. One of the biggest advantages that feature-based scanning has is the fact that with the proper intermediary software, the data derived from the scanning provides more control and can often be used directly for parametric modeling, and not just referenced. In feature-based scanning, basically, you can randomly scan sections of a part that are automatically turned into lines and splines for creating a digital surfaces and solids.

An example of a feature-based scanner, and the one I used, is Immersion Corp.’s MicroScribe MX measurement system. It is both portable and affordable, and is available in 5 or 6 degrees of freedom, is accurate to 0.002” (0.0508 mm), and its articulated mechanical arm has a reach of 25” (.63 m). The touch probe is somewhat like a paint brush or laser in that you can scribble on an object and store the data of the articulating arm’s movement.

DezignWorks software serves as a driver and interface between the MicroScribe MX (or other feature-based scanners) and SolidWorks or Inventor, transforming the scanned feature data directly into a solid model within SolidWorks or Inventor. It also works with laser scanners, but only feature-based scanning will be discussed here. DezignWorks creates native data that is parametric and ready to use in SolidWorks or Inventor. In fact, the data can come into SolidWorks or Inventor with sometimes little, if any, clean up required.

DezignWorks captures data directly from the MicroScribe MX as the touch probe moves randomly across, stores the movement of the touch probe, and transfers it to SolidWorks. During the digitizing procedure, the data can either be used to compare it to an existing digital solid model, or imported into SolidWorks to create a mesh for creating a digital solid model with ScanTo3D (a new capability found in SolidWorks Office Premium 2007). New or existing data can be added and reloaded into the DezignWorks database, automatically generating a new dataset for ScanTo3D. The Dezignworks software has best-fit capabilities for lines, arcs, circles, and splines. It also has several
utilities for curve editing, such as maintaining minimum distance while capturing complex curves, as well as spline uniformity.

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-- Jeff Rowe, Contributing Editor.


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