SDC PUBLICATIONS © 2012 Chapter 12 Parent/Child Relationships and the BORN Technique Learning Objectives:  Understand the Concept and Usage of the BORN.

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Presentation transcript:

SDC PUBLICATIONS © 2012 Chapter 12 Parent/Child Relationships and the BORN Technique Learning Objectives:  Understand the Concept and Usage of the BORN Technique  Understand the Importance of Parent/Child Relations in Features  Use the Suppress Feature Option  Resolve Undesired Feature Interactions

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 Introduction The parent/child relationship is one of the most powerful aspects of parametric modeling. In Autodesk Inventor, each time a new modeling event is created, previously defined features can be used to define information such as size, location, and orientation. The referenced features become PARENT features to the new feature, and the new feature is called the CHILD feature. The parent/child relationships determine how a model reacts when other features in the model change, thus capturing design intent. It is crucial to keep track of these parent/child relations. Any modification to a parent feature can change one or more of its children.

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 The BORN Technique The basic concept of the “Base Orphan Reference Node” (BORN) technique is to use a Cartesian coordinate system as the first feature prior to creating any solid features. With the Cartesian coordinate system established, we then have three mutually perpendicular datum planes (namely the XY, YZ, and ZX planes) available to use as sketching planes. The three datum planes can also be used as references for dimensions and geometric constructions. Using this technique, the first node in the history tree is called an “orphan,” meaning that it has no history to be replayed. The technique of creating the reference geometry in this “base node” is therefore called the “Base Orphan Reference Node” (BORN) technique. Autodesk Inventor automatically establishes a set of reference geometry when we start a new part, namely a Cartesian coordinate system with three work planes, three work axes, and a work point All subsequent solid features can then use the coordinate system and/or reference geometry as sketching planes.

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 The U-Bracket Design

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 Modeling Strategy

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 Applying the BORN Technique

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 The Base Feature

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 The Second Solid Feature

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 A Cut feature

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 Feature Suppression Feature suppression is a method that enables us to disable a feature while retaining the complete feature information; the feature can be reactivated at any time.

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 A Circular Cut Feature

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 A Flexible Design Approach

Tools For Design: AutoCAD® & Autodesk Inventor SDC PUBLICATIONS © 2012 View and Edit Material Properties