Chapter 12 Parent/Child Relationships and the BORN Technique Learning Objectives: Understand the Concept and Usage of the BORN Technique Understand the Importance of.
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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 SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor 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. SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor The BORN Technique SDC PUBLICATIONS © 2012 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 The U-Bracket Design SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor Modeling Strategy SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor Applying the BORN Technique SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor The Base Feature SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor The Second Solid Feature SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor A Cut feature SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor 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. SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor A Circular Cut Feature SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor A Flexible Design Approach SDC PUBLICATIONS © 2012 Tools For Design: AutoCAD® & Autodesk Inventor View and Edit Material Properties SDC PUBLICATIONS © 2012