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Chapter 2 Sketching, Constraining

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Chapter 2 Sketching, Constraining & Dimensioning Exercise 2-5 Inserting AutoCAD Data Applying Your Skills Skill Exercise 2-1 Skill Exercise 2-2 Checking Your Skills ... – PowerPoint PPT presentation

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Title: Chapter 2 Sketching, Constraining


1
Chapter 2Sketching, Constraining Dimensioning
2
Chapter 2 - Objectives
  • After completing this chapter, you will be able
    to do the following
  • Change the part and sketch options as needed
  • 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 command
  • Change a dimensions value in a sketch
  • Open and insert AutoCAD DWG data

3
Sketch Part - Application Options
  • Options
  • Customized your preferences
  • Settings are global
  • Affects all open new Inventor documents

4
Part - Application Options
  • Sketch on new part creation
  • Construction
  • Auto-hide in-line work features
  • Auto-consume work features and surface features
  • 3D grips
  • Edit Base Solids Using

5
Sketch - Application Options
  • 2D Sketch
  • Display
  • Overconstrained dimensions
  • Spline fit method
  • Heads-Up Display
  • 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
  • Point alignment
  • 3D Sketch

6
Units
  • Units
  • Default unit of measurement
  • Part, Assembly Drawing files
  • Template file
  • Changing - Overridden
  • Edit dimension

7
Templates
  • Templates
  • New files created from a template
  • Add or Modify templates
  • Template directory
  • Subdirectory
  • New Tab

8
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

9
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
  • Create 2D Sketch
  • Active sketch

10
Sketch the Outline of the Part
  • Step 1 - Sketches Overview
  • Sketching strategies, tools, techniques
  • 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

11
Dynamic Input
  • Polar or Cartesian Coordinates
  • Persistent Dimensions
  • Heads-Up Display Settings
  • Dimension Input

12
Sketch the Outline of the Part
  • Using the Sketch Tools
  • Visual feedback
  • Dynamic Input
  • Line Tool
  • Powerful tool
  • Endpoint - Arc
  • Object Tracking - Inferred Points
  • Dashed lines
  • Endpoints
  • horizontal
  • vertical
  • perpendicular

13
Sketch the Outline of the Part
  • Automatic Constraints
  • Constraint symbols
  • Scrubbing
  • different constraint applied
  • move the cursor so it touches

14
Constraint Persistence Inference
  • Persistence
  • Turns sketch constraints on/off
  • When on, sketch constraints are applied while
    sketching
  • When off, the constraint icon will appear on the
    screen, but it will not be applied to the sketch
  • Inference
  • Turns the preview of the constraint on/off
  • When off, Constraint Persistence is also turned
    off
  • When off, sketch constraints are not applied

15
Constraint Options
  • With Constraint Inference on you can control
    which sketch constraints can be inferred and
    which geometry they should be inferred from

16
Select Objects
  • Selecting Objects
  • individually objects
  • multiple objects
  • color change
  • Deleting Objects
  • right-click Delete

17
Measure Tools
  • Measure
  • Distances
  • Points
  • Edges
  • Faces
  • Parts
  • Angles
  • Loops
  • Area
  • Region Properties

18
Measure 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
19
Exercise 2-1
  • Creating A Sketch with Lines

Exercise 2-2
  • Creating a Sketch with Tangencies

20
Constraining the Sketch
  • Step 2 - Geometric Constraints
  • Apply behavior
  • Create relationships
  • Status Bar
  • Fully constrain
  • Use projected origin point
  • Constraint Types
  • 12 geometric constraints

21
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

22
Construction Geometry
  • Sketch tab gt Format panel
  • Add dimensions and constraints
  • Not visible when a feature is created
  • Always available in the sketch

23
Sketch Degrees of Freedom
  • To see the open degrees of freedom in a sketch
  • Right-click and click Show All Degrees of Freedom

24
Exercise 2-3
  • Adding and Displaying Constraints

25
Adding Dimensions Manually
  • Step 3 Adding Dimensions
  • All dimensions created are parametric
  • Control change size of geometry
  • General Dimensioning
  • Create linear, angle, radial, or diameter
  • Automatically snap
  • Extension lines
  • Preview image
  • Dimensioning Lines
  • Endpoints - two
  • Length
  • Dimensioning an Angle
  • Two lines
  • Arc

26
Adding Dimensions
  • Dimensioning Arcs and Circles
  • Default Arc radius
  • Default Circle diameter
  • Linear Diameter Dimensions
  • Revolved part
  • Represent a quarter outline
  • Axis of rotation
  • Dimensioning to a Tangency
  • Arc or circle
  • Constraint symbol changes
  • Two quadrants

27
Adding Dimensions
  • Entering and Editing a Dimensions Value
  • 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
  • Fractions

28
Adding Dimensions
  • Entering and Editing a Dimensions 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

29
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

30
Exercise 2-4
  • Dimensioning a Sketch

31
Move and Scale Tools
  • Move sketch objects to another location
  • Move or make copy
  • Scale a sketch
  • Enter scale factor
  • Pick two points
  • Relax dimensions
  • Relax constraints

32
Opening/Importing AutoCAD Files
  • Copy to clipboard within Inventor or 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)


33
Importing Other File Types
  • DXF
  • Alias
  • IDF Board File
  • IGES
  • JT
  • Parasolids Binary Files
  • Parasolids Text Files
  • PRO/Engineer Files
  • SAT
  • STEP
  • SolidWorks Files
  • UGS NX Files


34
Exercise 2-5
  • Inserting AutoCAD Data

35
Applying Your Skills
  • Skill Exercise 2-1 Skill Exercise 2-2

36
Checking Your Skills
  1. True__ False__ When you sketch, constraints are
    not applied to the sketch by default.
  2. True__ False__ When you sketch and a point is
    inferred, a constraint is applied to represent
    that relationship.
  3. True__ False__ A sketch does not need to be fully
    constrained.
  4. True__ False__ When working on an mm part, you
    cannot use English (inch) units.
  5. True__ False__ After a sketch is constrained
    fully, you cannot change a dimensions value.
  6. True__ False__ A driven dimension is another name
    for a parametric dimension.
  7. True__ False__ Dimensions placed dynamically are
    not parametric.
  8. True__ False__ You can import only 2D AutoCAD
    data into Autodesk Inventor.
  9. Explain how to draw an arc while in the Line
    command.
  10. Explain how to remove a geometric constraint from
    a sketch.
  11. Explain how to change a vertical dimension to an
    aligned dimension while you create it.
  12. Explain how to create a dimension between two
    quadrants of two arcs.
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