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April 06, 2006

Comments

Ken

While it is true that many engineering items are selected based on their specifications rather than their geometric match to something, it is also true that many parts are often mis-cataloged never to be found again and that there are also many parts that are impossible to catalog because their geometric form is what makes them unique. How do you catalog a wide variety of bulb seals or the many different plastic/fiberglass/aluminum extruded shapes that may exist using attributes. The best way to find these would be geometrically. I know that being able to search on a 2D profile of a part would make life here much easier.

maple story mesos

Regarding Purdue's sketch searcher, I've NEVER found anything close to what I was searching for.

Sanjib kumar Sahoo

Kindly send some projects for modelling .

Doug Love

It is true that in many engineering applications, especially where standard parts are used, text specifications are a good way of finding suitable parts (hence the use of PDM systems). However there are many applications where that isn't the case - try searching for a part called 'bracket' and you will see what I mean.

I'm not sure what Sean means by 'many attempts over the years' -There has been a lot of work done on 2D IMAGE retrieval using bit-maps and but that is not the same as vector-based engineering drawings or 3D models. These image systems (see the Princton work as an example of 3D work)are intended for art and design applications, not engineering use. They cannot deal with all the superfluous detail (borders, notes, dims etc) that appear on a real drawing.

Controlling variety means giving engineers tools that make re-use of designs as easy as possible. CADFind allows the designer to search the company's model/drawing database from within their own CAD system at the click of a button. This means that at an early stage in the development of the model a single click will see if anything already exists to do the job (text searches are easy too). Look at our web site or academic publications to see how well the system finds parts.

On the Purdue system - it should be noted that until recently the number of parts on their database was very small. As it grows you can expect the number of matches to improve considerably.

It is often that case that people make exagerated claims for the benefits offered by their products. In this case there is no need - there have been a number of academic studies that show that considerable potential exists for re-use of existing designs (20% is a conservative figure). The US Department of Defense have published costings that put savings at $33,000 every time an unnecessary design is avoided. For those cases where text specifications are ambiguous, inadequate, missing or where ease of use is key graphical searching systems offer a way forward.

Sean Dotson

While this is a novel idea (one that has seen many attempts over the years) it's not going to take off. Designers do not look for a part that "looks like" a bearing. They look for a bearing that meets specific parameters such as allowable load, PV values, allowable RPM etc..

I really only see this being useful in a situation where a company has MANY machined parts and wants to identify them by shape. Even here I see limited real-world uses.

Regarding Purdue's sketch searcher, I've NEVER found anything close to what I was searching for.

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