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How to Control Parameters in CATIA Generative Shape Design Workbench using Advanced Law

Trisha West

In CATIA, laws enable you to vary the value of a parameter. They can be found in several dialogue boxes within the GSD workbench. I will highlight the different types of laws in this blog post with a parallel curve.  

ParallelLaw1

The Law Definition dialogue box has four types of laws: constant, linear, S-type, and advanced. 

ParallelLaw2

ParallelLaw3

The last type, advanced law, allows for the user to define their own transitional profile. Say for instance that I would like to start my parallel law at 50mm and end at 90mm but I would like to define the shape as follows: linear for about 1/3rd of the transition, constant for the middle 1/3rd, then follows a spline curve for the last 1/3rd of the transition.  To begin, you need a linear reference line (the length of the line is arbitrary). For this example, a straight reference line was created on the xy plane. Next, a separate sketch was created on the xy plane. This sketch is used to define the shape of the advanced law.

ParallelLaw4

 

Now you are ready to create the advanced law.

ParallelLaw5

  ParallelLaw6

ParallelLaw7

 

This topic is included in the Rand 3D CATIA Advanced Surface Class.  www.Rand3D.com 

About the Author

Trisha West

Technical Training Engineer<br><br>Trisha has been providing professional training services for Rand 3D clients since 2012. Her extensive experience makes her an ideal instructor for both on-site and online classes for people at all levels, from introductory to advanced. She currently focuses on teaching end users how to effectively use CATIA V5, VPM Navi, and Creo Parametric. She also helps develop and review training material. Trisha has a B.Sc. in Aerospace Engineering from Ohio State University, and she is a Dassault Systèmes Certified instructor for CATIA V5 Part, Assembly and Surfacing modeling.

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