Lecture Autodesk inventor: Parametric modeling - An introduction
Parametric Modeling An Introduction
Parametric Modeling Also called: Featurebased modeling Constraintbased modeling Parametric Modeling uses parametric constraints to define and easily modify part features, and to create relationships between these features in order to create intelligent part models. These virtual parts can then be combined to form assembly models.
Features Basic unit of a parametric solid model A feature is a 3D shape. Parts are formed by their features Model features mimic actual design & manufacturing features (e.g., fillet, counterbore hole, draft angle) 2 basic kinds of model features:
Parametric Modeling Characteristics Model flexibility; easy to update, modify Reflects design intent (i.e., the purpose or function of a feature) Model history viewable in feature tree (similar to CSG) Drawings generated from parametric model are linked to model associative Relationships between parts are maintained in database assembly modeling
Top–Down: Product Development Product
Assembly Subassembly Part
Bottomup: Part Modeling 1. Define sketch plane 2. Sketch the geometry
1. 2. 3. 4.
Some geometric constraints added automatically
Add other geometric constraints Add dimensions fully constrained Create the (base) feature Repeat 1 to 5, adding other (sketched and/or builtin) features
Sketch Rough sketch
Some geometric constraints are automatically applied