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A third solution is electronically attaching quality information to a 3D CAD model, making it more intelligent. This is part of the growing trend towards Model-Based Defi nition, or MBD. “Embodying quality information such as GD&T electronically with the master 3D CAD model is the most effi cient way of communication,” stated Woodbine. He sees many of his key customers moving in this direction. PC-DMIS has routines to help automate creation of measurement programs using such embedded GD&T as input. It supports creating these automated programs for CMMs, laser trackers, and portable CMMs, as well as specialized routines for gears and blades. One problem Woodbine was quick to point out is that GD&T alone does not specify the methods or machines for measuring—it only states the tolerances to be met. “But if it can be consumed by measurement software, as we can with PC-DMIS, we can con- vert into a measurement program,” he said. “It saves a lot of time and creates confi dence in the result, as long as that GD&T is created correctly. PC-DMIS has routines for checking the validity of attached GD&T.”


Speed and Automation


Besides accuracy and design in- tent, another important problem MBD is solving is speeding up data fl ow, according to Phil Hewitt, manufactur- ing product manager at Autodesk Inc. (San Rafael, CA). The fl ow of data in today’s complex supply chains is an important bottleneck. “A 2D represen- tation on a drawing requires human interpretation,” he said, which, besides being prone to error, is also slow. MBD offers the possibility of automating the data fl ow. “Machine-readable semantic data can link the real requirements electronically to the relevant features in the CAD fi le,” he said.


He also sees this in the context of a broader vision. At- taching GD&T information to CAD models is essential in meeting the vision of Industry 4.0 or Smart Manufacturing. “Think of it as enabling the full digital twin,” Hewitt explained,


Cut Precision Internal Threads The New Method To


Leistritz has developed internal whirling, a process to cut long internal threads without tilting the tool at helix angle. The method utilizes the bore to support the carbide or CBN cutting tool for extremely accurate profiles and overall geometries. This special


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Leistritz Advanced Technologies Corp.


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August 2017 | AdvancedManufacturing.org 77


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