Cadalyst - September 2008 - (Page 36)

mcadmodeling By Mike Hudspeth, IDSA Is 2D Drawing Doomed? On the contrary, drafting still has a role in the world of more accurate 3D modeling. D uring my last few semesters of high school, I stressed out about what I would do for a living. My mother wanted me to be a doctor — she even named me Michael David so I would be an M.D. from the start. Unfortunately, I didn’t really want to be a doctor, but I had to do something. I wanted a job that would always be in demand. I looked hard and settled on drafting. Everything had to be designed, I reasoned, so there would always be a need for someone to document the design. I would be a mechanical draftsman, I concluded, thus fulﬁlling my mother’s wish for me to be an M.D. I have since moved on to other titles, and my job today is very different than the jobs I held in those early years. For me, the changes in my professional life were mostly out of necessity. But what about all the professionals today who create 2D drawings and depend on that skill for income? Some say that 2D drawing is becoming obsolete. I have to ask: Is it really? In the good old days, if you wanted to create a product of any kind you sat down at a drawing board and sketched it. Next, you cleaned up your 2D drawings and added dimensions. Finally, you sent a large rolled up or folded piece of paper to your machine shop or builder. One of the things you had to worry about was a clumsy layout. On paper, if you began too close to an edge and had to add another view, you were out of luck; you ran out of room. It’s embarrassing how many times I had to start over and trace something I had already done. And when you added notes, you could run into the same problem again. A drawing had only so much room, and once you started, you were committed. These problems were fixed for the most part when we left the drawing board and went to CAD. We could move things around to our heart’s content until we had what we wanted. One problem persisted, however. I have known a lot of drafters in my career who were very talented organizers. (You really need that ability to do the job properly.) But one thing I was surprised to learn was that drafters aren’t always artists. I worked with and saw the work of an amazing number of people who had no art skills whatsoever. Their drawings were barely readable. They just couldn’t visualize in 3D. Elevations were questionable, and isometric views were a mess. They had everything dimensioned correctly, but very often the view wasn’t depicted correctly. Even with a CAD system, 2D drafting is hit or miss. No matter how you shake it, you are still limited in 2D by what a drafter can visualize. 36 Figure 1. It’s never been so easy to create a 2D drawing. Just pick your model and place it. After the first view is in place, the rest are a cinch. How’s that Different? When you are working in 3D, you are no longer limited by inability to visualize. Actually, creating drawings in a 3D system sounds pretty similar to what we have always done. In the modern 3D world, we still sketch. We can even sketch the same way we did in 2D, but our designs don’t have to stay in 2D. We can scan our sketches and build 3D models directly from them, matching the curves we like with great precision. I guess the biggest difference between 2D and 3D is that we no longer try to depict what something will look like from certain angles. What we’re doing now is actually — or virtually — building a part. We don’t have to figure it out or try to see what it’ll look like — we can just rotate it and see. There’s no real art to it. 3D modeling is a better method — and a more consistently accurate one. It takes the guesswork out of the job. We still create 2D drawings, even in 3D systems. In most systems, all you do is add your model — be it a part or an assembly, a machine or a house — to the drawing and then place other orthographic views around it (figure 1). The modeling system takes care of depicting what the model will look like in each view. Some systems even will use a standard layout with certain built-in specified views. One, two, three, and you’re done. How easy can it be? After you’ve finished your 3D model, making a 2D drawing takes almost no time at all. Of course, you still must add your dimensions. But some systems can even inherit those from your modeling sketches. Creating 2D drawings is so easy, in www.cadalyst.com cadalyst September 2008 http://www.cadalyst.com

Table of Contents Feed for the Digital Edition of Cadalyst - September 2008

Cadalyst - September 2008 Contents Editor's Window Cad Central Tech Trends: Genie Out of the Bottle Cadalyst Labs Reviews: Big Tools for Big Jobs — Wide-Format Scanners and Printers Make Small Work of Large Projects Cadalyst Labs Reviews: AutoCAD 2009 — General-Purpose CAD Software Cadalyst Labs Reviews: AecBatchStylesEditor 2009 — CAD Standards Management Software for AEC Cad manager: Synchronize CAD Files over a Wide Area MCAD Modeling: Is 2D Drawing Doomed? Plm Strategies: More Bang for Your Truck Aec Insight: Works and Plays Well with Others Cad Cartoon Issue Indexes Hot Tip Harry: VBA Hints for Customizing AutoCAD

Cadalyst - September 2008

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