There are numerous software solu-tions available for real-time, CAD-based measuring metrology. Each one has strengths and shortfalls that distinguish them from the others. Key aspects to consider when looking for the best solution are:

Ability to read, organize and work with CAD models accurately and easily. Many systems are based on proprietary viewers. These may struggle with larger CAD models, are subject to reversing surface normals, missing surfaces, and have little or no way to fix problems or make needed adjustments to models. CAD-based systems are built upon robust, proven CAD/CAM platforms that do a better job of handling models and bringing them in organized on layers/levels and colors of the original model.

Able to read native CAD models. Most systems require neutral formats such as IGES and/or STEP. A more versatile and enterprise friendly system can read native models such as Catia, Solidworks, Unigraphics, Pro-Engineer, etc.

True, real-time operation. Older technology only allows the operator to take data and then later produce a result. Newer systems are live, giving instant “virtual gage” operation.
Modern alignment techniques. All metrology systems have some method of aligning the CAD model with the device and the part.

But many use old limited techniques that are difficult, slow and are not saved as part of a fixed inspection routine. Newer methods involve automated alignment tools that are easy to create, easy to learn, and are saved in the model so that each ensuing alignment is done quickly and the same way every time.

Robust, customizable reporting. Im-portant is the ability to customize reports, display and print graphical color maps, and compatibility with widely used business software such as

Microsoft Excel.
Best-fit with control over six axes. In order to utilize the full range of tolerance available, best-fit allows the data set to be shifted relative to the model using proven, accurate algorithms. This can save a part that would otherwise be scrapped.

Full support of MBD. The software needs to offer the ability to set unique tolerances, datum constraints and entity IDs in the model. Modern systems are able to read these elements directly from the native model.

Compatibility with a broad spectrum of measurement device types and manufacturers, allowing a common metrology platform within the enterprise.

Companies are quickly recognizing the considerable productivity advancements and lean techniques provided by model-based manufacturing and inspection. They also are finding that these methods are vast improvements in collaboration and process control throughout the entire enterprise. Furthermore, it is difficult to ignore the fact that major manufacturers are demanding that their partners utilize these modern processes as part of their digital product definition strategy.