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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:
Sketched (e.g., extrusion, revolution, loft) Builtin (e.g., hole, chamfer, fillet, shell)
No sketch required
Parameters
A parameter is a named quantity whose value can be changed
For example, d0 = 10 Parametric dimensions:
Control feature size
Are easily modified feature geometry changes
Establish relationships across features, parts, assemblies
For example, d0 = d1/2
Constraints
A constraint is a mathematical requirement placed on the geometry of a 3D model
Kinds of part constraints:
Dimensional – limits feature size
Geometric – limits feature shape (e.g., parallelism tangency, colinearity)
Assembly constraints (e.g. mate, insert)
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