Tech Directions - February 2008 - (Page 18)

Tips on Creating Complex Geometry Using Solid Modeling Software By George Gow George.Gow@eku.edu T HREE-dimensional computer-aided drafting (CAD) software, some times referred to as solid modeling software, is easy to learn, fun to use, and becoming the standard in industry. However, many users have difficulty creating complex geometry with the solid modeling software. And the problem is not entirely a student problem. Even some teachers and other CAD professionals experience difficulty creating complex geometry with their solid modeling software programs. This article provides assistance. say that all solid modeling begins with the construction plane. Using a construction plane isn’t difficult when creating simple solid models because software programmers have provided a default construction plane on which to begin modeling. The solid modeling pro- lel and angled construction planes from existing construction planes. The basic process of creating solid models is simple, logical, and easy to learn. So, where does the difficulty enter? Some complex features found on machine parts may require multiple steps to create the Fig. 1 30° 45° 1.0 Background In most cases, the problem centers on a modeling function known as a construction plane. This is one of the most basic concepts in a solid modeling software system. The construction plane is identified by different names on different software products. It might be called the reference plane, the work plane, or the modeling plane. The term construction plane is the generic term for a two-dimensional plane on which the two-dimensional sketches are drawn. These twodimensional sketches are used to create the three-dimensional features of the solid models. We might George Gow is professor, Department of Technology, Eastern Kentucky University, Richmond. cess also involves the use of commands and command options that allow for the creation of additional construction planes. The process typically begins with a two-dimensional sketch drawn on a default construction plane. The sketch then is turned into a threedimensional form, and any of the surfaces of the resulting three-dimensional form can easily be selected as a new construction plane. We can easily build additional paral- required construction plane. Each of these steps rests on the CAD operator’s personal visual spatial skills, as well as an understanding of the relationships between the required construction plane and the geometry (the points, lines, and surfaces) of the part being modeled. Sample Problem It may be helpful to examine one of many machine features that can cause difficulty while using a solid 18 techdirections ◆ FEBRUARY 2008

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Tech Directions - February 2008 Technically Speaking Contents Direct from Washington The News Report Technology’s Past Technology Today Mastering Computers How Engineers Engineer—Lessons from My First Big Engineering Project Tips on Creating Complex Geometry Using Solid Modeling Software Press to Test—Shop-Built BJT Checker Is Easy Cable Television Technician International Technology Education Association Conference—Teaching TIDE with Pride Professional Development Opportunities Product Central Free for the Asking More than Fun

Tech Directions - February 2008

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