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# Catia V5 Fundamentals Tutorial

There are times when a part has to be robust enough to handle several variations of design features and/or iterations. This would be the case when you build start parts or master models that give the designer a starting point for a complex design. A master model is critical if the parts you design always have the same basic features, but the details of those features vary. The most obvious case would be a plate that has variable length, width and height, as well as possibly having a few holes whose locations or sizes might change where each of the values can be driven by global parameters. What happens when you need to change the geometry of a body or feature but don't want to have repetitive design features or you want to avoid a complex tree structure? You use a geometric parameter of course! This article will walk you through the use of these geometric parameters to solve this problem.

Note: In order to recreate this exercise your CATIA package will need to have the Knowledgeware Advisor (KWA) workbench. It will also be an assumption that you know how to easily create geometric sets, parameters, formulas and rules.

The example described is a simple flat head screw which will have different head types or tool slots. It exemplifies a Flat, Phillips, Hex, Star and a random swirl shape to show the extreme variations that can be created.

To start with, it is assumed you already have an existing part created, but do not have the ability to add much variation to that part without a considerable amount of design time or manipulation. The first thing you will need to add is a variable to trigger the change you want to create. In the example, a String parameter called "PROFILE" was created with multiple values (Flat, Phillips, Hex, Torx and Swirl-E-Bob). The different values of this parameter will determine which sketch is used to populate the curve parameter, but let's not get too far ahead of ourselves!

The next parameter that needs to be created is a CURVE parameter. This parameter can be found near the end of the parameter list and is surrounded by the other geometric parameters including Surface, Plane, Circle, Line and Point. A geometric parameter is like any other parameter and can be thought of as an empty placeholder of a specific unit. Typically, a parameter is not very useful until it has a value specified. In the case of a geometric parameter, the value or unit is a form of geometry; therefore a curve parameter's value can be a sketch, spline, polyline or any other form of wireform geometry.

Now that the trigger and the placeholder have been created, the values of the curve parameter need to be created. These values will be sketches in the screw example, but can be anything that can be described as a curve. Five sketches were created and each named according to the profile being created - Straight, Cross, Hexagon, Star and Swirl. The naming is done to make it easier to identify the profiles and I would highly recommend naming them logically, but is not necessary as each sketch has its own proprietary name by default.

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• (80 stars)

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• (80 stars)

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