When you think of Harley-Davidson motorcycles, often referred to as “hogs,” its iconic, rumbling sound is often the first thing that comes to mind. The company at one point famously sought to trademark its bikes’ distinctive sound. It sounds this way because of its unique two-cylinder, v-twin engine design. The engine has a single pin […]
The failed promise of parametric CAD, final chapter: A viable solution
What is the failed promise of parametric CAD? In short, model reuse. It’s a lot more difficult than it ought to be, for a variety of reasons. Several months back, I wrote a series of articles discussing those reasons, as well as some of the solutions that have come up over the years. What was missing […]
The failed promise of parametric CAD part 5: A resilient modeling strategy
The model brittleness problem inherent with parametric feature-based modeling is a really big deal. And it’s something, honestly, that I don’t have a great answer for. I’ve even asked a few power users who I know, and their answers seemed to involve a bit of hand-waving, and a reference to having lots of experience. While […]
The failed promise of parametric CAD part 4: Going horizontal
In the early 90s, Ron Andrews, a senior product designer at Dephi’s Saginaw Steering Systems Division, became fed-up with the difficulties of editing parametric CAD models. So, he and a team of his colleagues, including Pravin Khurana, Kevin Marseilles, and Diane Landers, took on a challenge of trying to find a solution. They came up […]
The failed promise of parametric CAD part 3: The direct solution
Direct modeling—a syncretic melding of concepts pioneered by CoCreate, Trispectives, Kubotek (and many others)–has shown the most promise to cure the parametric curse. Direct modeling is today’s hot CAD technology. PTC, Autodesk, Siemens PLM, Dassault (CATIA, but not so much SolidWorks), IronCAD, Kubotek, Bricsys, SpaceClaim (and certainly some other companies I’ve forgotten) all have their […]
The failed promise of parametric CAD part 2: The problem is editing
In the previous post, I wrote about the failed promise of parametric CAD: problems such as parent-child dependencies and unwanted feature interactions, coupled with no easy way to either prevent, or check for them. The difference between modeling and editing in a parametric CAD system is simply the difference between creating things from scratch, and […]
The failed promise of parametric CAD part 1: From the beginning
The modern era of 3D CAD was born in September 1987, when Deere & Company bought the first two seats of Pro/Engineer, from the still new Parametric Technology Corporation. A couple of years later, Deere’s Jack Wiley was quoted in the Anderson Report, saying: “Pro/ENGINEER is the best example I have seen to date of […]
PTC: The importance of design agility
Here’s an interesting term: Design agility. PTC defines it, generally, as “the power to make late-stage design changes quickly and easily .” They define it more specifically as “the ability to rapidly recognize features and patterns in imported models, enabling seamless modifications; design intelligence for dumb models.” You might expect that more specific definition from PTC, […]
Organic shape modeling with PTC Creo Parametric Freestyle
There is no standard definition for what an “organic shape” is. Probably the best definition, in the context of CAD, is that it’s a shape that’s a real pain in the neck to model using traditional methods with NURBS surfaces. Here’s an example. While you could certainly find a way to model this shape with NURBS, […]
How Whirlpool uses PTC CAD and PLM technology
Home appliances aren’t what they used to be. Consider, for example, washers and dryers. At this week’s PlanetPTC conference, Fred Bellio, CIO of Whirlpool’s Global Product Organization, and Jeff Burk, Director of Whirlpool’s Constellation Program Management Office, described some of the complexities of his company’s Maytag Maxima line of washers and dryers. Washers and dryers […]
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