© 2012 Autodesk AC2724 – 2D Parametrics in AutoCAD® and Why You Need to Use Them Rick Ellis President, Cadapult Software Solutions

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Presentation transcript:

© 2012 Autodesk AC2724 – 2D Parametrics in AutoCAD® and Why You Need to Use Them Rick Ellis President, Cadapult Software Solutions

© 2012 Autodesk Introduction  Welcome  Who am I  Who are you  Who should attend  Class surveys  Agenda

© 2012 Autodesk Agenda  Overview  What is parametric drawing?  Parametric Constraints  Geometric Constraints  Dimensional Constraints  Constraints in Dynamic Blocks  Constraints to manage annotation?

© 2012 Autodesk What About Questions???  Short time for questions at the end of each topic  After the session  Via

© 2012 Autodesk Examples of Parametric Drawings

© 2012 Autodesk Overview  Have you ever wanted to…  Keep two lines parallel or perpendicular even if you edit one?  Keep two lines the same length throughout the editing process?  Maintain any important geometric relationships between objects?  Edit a dimension and have the object update?  If you answered “Yes” to any of these questions then the answer is Parametric drawing.

© 2012 Autodesk What is parametric drawing?  The Autodesk Definition: “Feature in AutoCAD that assigns constraints to objects, establishing the distance, location, and orientation of objects with respect to other objects.”  A feature that allows objects to be related to each other.  “Sticky” or persistent object snaps.  Dimensions that drive geometry.

© 2012 Autodesk Parametric Constraints  Constraints are associations and restrictions applied to 2D geometry.  AutoCAD uses two types of Parametric Constraints:  Geometric Constraints  Dimensional Constraints

© 2012 Autodesk Geometric Constraints  The Autodesk Definition: “Rules that define the geometric relationships of objects (or points of objects) elements and control how an object can change shape or size.”  “Sticky” Object Snaps. They maintain the geometric relationship between objects rather than setting it once at the time you use the object snap and then allowing it to change in the future.  Add intelligence to your drawings.  Allow you to think more about modeling and less about drafting.

© 2012 Autodesk Types of Geometric Constraints  Coincident  Co-linear  Perpendicular  Parallel  Horizontal  Vertical

© 2012 Autodesk Types of Geometric Constraints  Tangent  Concentric  Equal  Symmetric  Smooth  Fixed

© 2012 Autodesk Geometric Constraints ObjectsConstraint Points LineEndpoints, Midpoint ArcCenter, Endpoints, Midpoint SplineEndpoints Ellipse, CircleCenter PolylineEndpoints, midpoints of line and arc, center of arc Block, Xref, Text, Mtext, Attribute, TableInsertion point

© 2012 Autodesk Adding Constraints Automatically  Auto-Constrain  Inferred Constraints

© 2012 Autodesk Tips when creating Geometric Constraints  When applying constraints between two entities AutoCAD modifies the second entity selected, leaving the first entity unmodified.  If you convert an object that has constraints to a ployline the constraints are lost.  If you explode a polyline that has constraints the constraints are lost.  If you copy an object with constraints the constraints are copied if all the objects involved in the constraint are copied.

© 2012 Autodesk Working with Geometric Constraints

© 2012 Autodesk Dimensional Constraints  The Autodesk Definition: “Parametric dimensions that control the size, angle, or position of geometry relative to the drawing or other objects. When dimensions are changed, the object resizes.”  You type the value into a dimension and the object updates.  Can include equations.  Can even reference other objects. For example, line 1 is twice the length of line 2.

© 2012 Autodesk Types of Dimensional Constraints  Aligned  Horizontal  Vertical  Radial  Diameter  Angular

© 2012 Autodesk Dimensional Constraints  Can constrain the following properties:  Distances between objects, or between points on objects  Angles between objects, or between points on objects  Sizes of arcs and circles  Two different kinds of dimensional constraints  Dynamic  Annotational

© 2012 Autodesk Dimensional Constraints  Dynamic  Maintain the same size regardless of zoom level  Can easily be turned on or off globally in the drawing  Display using a fixed, predefined dimension style  Position the textual information automatically, and provide triangle grips with which you can change the value of a dimensional constraint  Do not display when the drawing is plotted  Can be converted to Annotational Constraints using the Properties Palette

© 2012 Autodesk Dimensional Constraints  Annotational  Change their size when zooming in or out  Display individually with layers  Display using the current dimension style  Provide grip capabilities that are similar to those on dimensions  Display when the drawing is plotted  Can be converted to Dynamic Constraints using the Properties Palette

© 2012 Autodesk Tips when creating Dimensional Constraints  When applying dimensional constraints AutoCAD modifies the constrained geometry to satisfy the new constraint.  If you convert an object that has constraints to a ployline the constraints are lost.  If you explode a polyline that has constraints the constraints are lost.  If you copy an object with dimensional constraints the constraints are copied.  Dimensional constraints can contain equations.

© 2012 Autodesk Working with Dimensional Constraints

© 2012 Autodesk Constraints in Dynamic Blocks  Both geometric and dimensional constraints can be used in dynamic blocks.  Constraint Parameters combine the features of a dimensional constraint and a block parameter.  Add constraints to blocks in the block editor using the commands on the Block Editor tab of the Ribbon.

© 2012 Autodesk Working with Constraints in Dynamic Blocks

© 2012 Autodesk Things to Remember  Geometric Constraints are like “Sticky” Object Snaps.  The second object is the one changed.  Dimensional Constraints let you edit objects by changing the dimension value.

© 2012 Autodesk Still Have Questions???  After the session  Via

© 2012 Autodesk Thank you for your time and attention! Rick Ellis

© 2012 Autodesk Autodesk, AutoCAD* [*if/when mentioned in the pertinent material, followed by an alphabetical list of all other trademarks mentioned in the material] are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA and/or other countries. All other brand names, product names, or trademarks belong to their respective holders. Autodesk reserves the right to alter product and services offerings, and specifications and pricing at any time without notice, and is not responsible for typographical or graphical errors that may appear in this document. © 2012 Autodesk, Inc. All rights reserved.