6.0
Table Of Contents
- Getting Started with Autodesk® Mechanical Desktop®
- Autodesk® Mechanical Desktop® Tutorials
- Using the Tutorials
- Creating Parametric Sketches
- Constraining Sketches
- Creating Sketched Features
- Key Terms
- Basic Concepts of Sketched Features
- Creating Extruded Features
- Editing Extruded Features
- Creating Loft Features
- Editing Loft Features
- Creating Revolved Features
- Editing Revolved Features
- Creating Face Splits
- Editing Face Splits
- Creating Sweep Features
- Editing Sweep Features
- Creating Bend Features
- Editing Bend Features
- Creating Work Features
- Creating Placed Features
- Key Terms
- Basic Concepts of Placed Features
- Creating Hole Features
- Creating Thread Features
- Editing Hole Features
- Editing Thread Features
- Creating Face Drafts
- Editing Face Drafts
- Creating Fillet Features
- Editing Fillet Features
- Creating Chamfer Features
- Editing Chamfer Features
- Creating Shell Features
- Editing Shell Features
- Creating Surface Cut Features
- Editing Surface Cut Features
- Creating Pattern Features
- Editing Pattern Features
- Editing Array Features
- Creating Copied Features
- Editing Copied Features
- Creating Combined Features
- Editing Combined Features
- Creating Part Splits
- Editing Part Splits
- Using Design Variables
- Creating Parts
- Creating Drawing Views
- Creating Shells
- Creating Table Driven Parts
- Assembling Parts
- Combining Parts
- Assembling Complex Models
- Key Terms
- Basic Concepts of Complex Assemblies
- Starting the Assembly Process
- Creating Local and External Parts
- Applying Assembly Constraints
- Creating New Parts
- Creating Subassemblies
- Completing Assemblies
- Editing Mechanical Desktop Parts
- Reloading External References
- Reviewing Assembly Models
- Creating Bills of Material
- Finishing Drawings for Plotting
- Creating and Editing Surfaces
- Combining Parts and Surfaces
- Surfacing Wireframe Models
- Key Terms
- Basic Concepts of Surfacing Wireframe Models
- Surfacing Wireframe Models
- Creating Trimmed Planar Surfaces
- Joining Surfaces on Complex Shapes
- Creating Swept and Projected Surfaces
- Creating Complex Swept Surfaces
- Using Projection to Create Surfaces
- Using Advanced Surfacing Techniques
- Viewing Completed Surfaced Models
- Working with Standard Parts
- Creating Shafts
- Calculating Stress on 3D Parts
- Toolbar Icons
- Desktop Tools
- Part Modeling
- Part Modeling ‰ New Part
- Part Modeling ‰ New Sketch Plane
- Part Modeling ‰ 2D Sketching
- Part Modeling ‰ 2D Constraints
- Part Modeling ‰ Profile a Sketch
- Part Modeling ‰ Sketched Features
- Part Modeling ‰ Placed Features
- Part Modeling ‰ Work Features
- Part Modeling ‰ Power Dimensioning
- Part Modeling ‰ Edit Feature
- Part Modeling ‰ Update Part
- Part Modeling ‰ Part Visibility
- Part Modeling ‰ Options
- Toolbody Modeling
- Assembly Modeling
- Surface Modeling
- Surface Modeling ‰ AutoSurf Options
- Surface Modeling ‰ Swept Surface
- Surface Modeling ‰ Loft U Surface
- Surface Modeling ‰ Blended Surface
- Surface Modeling ‰ Flow Wires
- Surface Modeling ‰ Object Visibility
- Surface Modeling ‰ Surface Display
- Surface Modeling ‰ Stitches Surfaces
- Surface Modeling ‰ Grip Point Placement
- Surface Modeling ‰ Lengthen Surface
- Surface Modeling ‰ Extract Surface Loop
- Surface Modeling ‰ Edit Augmented Line
- Surface Modeling ‰ Wire Direction
- Scene
- Drawing Layout
- Mechanical View
- Index
86 | Chapter 7 Constraining Sketches
Constraining Tips
Constraining Sketches
Constraining a sketch defines how a sketch can change shape or size. In addi-
tion to the inferences by the software, you often need additional dimensions
or constraints.
Constraints may be fixed or variable, but they always prevent unwanted
changes to a feature as you make modifications.
Tip Explanation
Determine sketch
dependencies
Analyze the design to determine how sketch elements
interrelate; then decide which geometric constraints are
needed.
Analyze automatically
applied constraints
Determine the degrees of freedom not resolved by automatic
constraints. Decide if any automatic constraints need to be
deleted in order to constrain elements as you require.
Use only needed
constraints
Replace constraints as needed to define shape. Because
constraints often solve more than one degree of freedom, use
fewer constraints than degrees of freedom.
Stabilize shape
before size
If you apply geometric constraints before dimensions, your
sketch shape is less likely to become distorted.
Dimension large
before small
To minimize distortion, define larger elements that have an
overall bearing on the sketch size. Dimensioning small elements
first may restrict overall size. Delete or undo a dimension if the
sketch shape is distorted.
Use both geometric
constraints and
dimensions
Some constraint combinations may distort unconstrained
portions of the sketch. If so, delete the last constraint and
consider using a dimension or a different constraint
combination.