Transcript Chapter 2 Sketching, Constraining & Dimensioning

Chapter 2
Sketching, Constraining &
Dimensioning
Chapter 2 - Objectives
• After completing this chapter, you will be
able to do the following:
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Change the sketch and part options
Sketch an outline of a part
Create geometric constraints
Use construction geometry to help constrain sketches
Dimension a sketch
Create dimensions using the automatic dimensioning
tool
– Change a dimension’s value in a sketch
– Import AutoCAD DWG data
Sketch & Part - Application
Options
• Options
– Customized your preferences
– Settings are global
– Affects all open & new Inventor documents
Sketch - Application Options
• Constraint Placement
Priority
• Display
• Overconstrained
Dimensions
• Snap to Grid
• Edit dimensions when
created
• Autoproject edges during
curve creation
• Autoproject edges for sketch
creation and edit
• Autoproject part origin on
sketch create
• 3D Sketch
Part - Application Options
• Sketch on New
Part Creation
• Construction
• Auto-hide in-line
work features
• Auto-hide in-line
work features
• Auto-consume
Work Features and
Surface features
Part - Application Options
• 3D Grip
Dimensional
Constraint
Relocation
• 3D Grip Geometric
Constraint
Relocation
Units
• Units
– Default unit of
measurement
– Part, Assembly &
Drawing files
– Template file
– Changing Overridden
– Edit dimension
Templates
• Templates
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New files created from a template
Add or Modify templates
Template directory
Subdirectory
• New Tab
Creating a Part
• From the Open dialog box click the
Standard.ipt icon in the Open dialog box
• From the New file drop list on the Standard
toolbar
Creating a Part
•Sketches & Default Planes
–Sketch plane
• 2D objects are sketched
• Active sketch
• Three planes
– XY,YZ, and XZ
• Three Axes
– X, Y, and Z
• Center
– Origin - point at the intersection
• Browser
•New Sketch
–Active sketch
Sketch the Outline of the Part
• Step 1 - Sketches Overview
– Sketching strategies, tools, & techniques
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Outline
Draw to finished size/shape
Visual Guide – distance & angle
No overlaps & gaps
Keep shape simple
Closed vs. Open shape
– Sketch Tools
• Sketching tools
• Expert mode on/off
Sketch the Outline of the Part
• Using the Sketch Tools
– Visual feedback
• Line Tool
– Powerful tool
– Endpoint - Arc
• Inferred Points
– Dashed lines
– Endpoints
• horizontal
• vertical
• perpendicular
Sketch the Outline of the Part
• Automatic Constraints
– Constraint symbols
• Scrubbing
– different constraint applied
– move the cursor so it touches
• Selecting Objects
– individually objects
– multiple objects
– color change
• Deleting Objects
– right-click
Measure Tools
• Measure
– Distances
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Points
Edges
Faces
Parts
Angles
Loops
Area
Region Properties
Analysis Tools
• Measure
– Additional Options
• Click the arrow in the
Measure dialog box
Reset
Clears the contents of the measurement box
Add to Accumulate
Adds the measurement in the measurement box to the
accumulate
Clear Accumulate
Clears all measurements from the accumulate sum
Display Accumulate
Displays the sum of all measurements added to the
accumulate
All Decimals
Changes the decimal display between all decimals and
the number of decimal places specified in the document
settings
Exercise 2-1
• Creating A Sketch with Lines
Exercise 2-2
• Creating a Sketch with Tangencies
Constraining the Sketch
• Step 2 - Geometric Constraints
– Apply behavior
– Create relationships
• Status Bar
• Fully constrain
• Fix constrain
– Constraint Types
• 11 geometric constraints
Constraining the Sketch
• Geometric Constraints
– Adding Constraints
• Applying
• Over-constrain
– Constraint Visibility
Constraining the Sketch
• Geometric Constraints
– Dragging a Sketch
• Constrained or Not
• Geometry stretches
– Showing Constraints
• Show all & Hide all F8
and F9
• To see applied constraints
• Objects change color
– Deleting Constraints
• Right-click or Delete key
Construction Geometry
• Standard toolbar
• Add dimensions and
constraints
• Not visible when a feature is
created
• Always available in the sketch
Exercise 2-3
• Adding and Displaying Constraints
Adding Dimensions
•Step 3 – Adding Dimensions
–All dimensions created are parametric
–Control & change size of geometry
–General Dimensioning
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Create linear, angle, radial, or diameter
Automatically snap
Extension lines
Preview image
–Dimensioning Lines
• Endpoints - two
• Length
–Dimensioning an Angle
• Two lines
Adding Dimensions
–Dimensioning Arcs and
Circles
• Circumference
• Arc = radius
• Circle = diameter
–Diametric Dimensions
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Revolved part
Represent a quarter outline
Linear diameter
Axis of rotation
–Dimensioning to a Tangency
• Arc or circle
• Constraint symbol changes
• Two quadrants
Adding Dimensions
• Entering and Editing a Dimension’s Value
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Automatically appear
Change the value
Edit Dimension option
Default value
To change double-click
Enter exact value
Accurate to six decimal places
Smallest dimensions first
Adding Dimensions
•Entering and Editing a Dimension’s Value
–Repositioning a Dimension
• New location
• Origin points cannot be moved
–Over-Constrained Sketches
• Inventor will not allow
– over-constrain
– duplicate constraints
– conflict with another constraint
–Driven dimension
• Reference dimension
• Parentheses
• Over-constrained dimensions option
Adding Dimensions
•Auto Dimension
–Automatically apply
• Dimensions
• Constraints
–State number of dimensions or constraints
required to fully constrain the sketch
–First apply critical constraints and dimensions
–Will not override or replace existing constraints or
dimensions
Exercise 2-4
• Dimensioning A Sketch
Opening/Importing AutoCAD Files
• Copy to clipboard within
AutoCAD and Paste in Inventor
• Open/Import AutoCAD &
AutoCAD Mechanical Files
– New Drawing
– New Part
– Title Block
– Border
– Symbol
– 2D and 3D
• Import 2D geometry to an active
sketch (part or drawing)
Move and Scale Tools
• Move
– Move the objects to another location
• Scale
– Scale sketch
Importing Other File Types
• SAT
• STEP
• PRO/E up to Version 20
• DXF
• IGES
– Construction Environment
– Toolset
Exercise 2-5
• Inserting an AutoCAD File
Applying Your Skills
• Skill Exercise 2-1
• Skill Exercise 2-2