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Chapter 2 Sketching, Constraining & Dimensioning. Chapter 2 - Objectives. After completing this chapter, you will be able to: Change the part and sketch Application Options Sketch an outline of a part Create geometric constraints to a sketch to control design intent

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chapter 2 objectives
Chapter 2 - Objectives
  • After completing this chapter, you will be able to:
    • Change the part and sketch Application Options
    • Sketch an outline of a part
    • Create geometric constraints to a sketch to control design intent
    • Use construction geometry to help constrain a sketch
    • Dimension a sketch
    • Change a dimension’s value in a sketch
    • Insert AutoCAD DWG data into a part’s sketch
part sketch application options
Part & Sketch - Application Options
  • Options
    • Customized your preferences
    • Settings are global
    • Affects all open & new Inventor documents
part application options
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
sketch application options
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
units
Units
  • Units
    • Default unit of measurement
    • Part, Assembly & Drawing files
    • Template file
    • Changing - Overridden
    • Edit dimension
templates
Templates
  • Templates
    • New files created from a template
    • Configure Default Template
    • Template directory
    • Subdirectory
      • New Tab
creating a new part
Creating a New Part
  • Application Menu
  • Quick Access toolbar
  • New file drop list on the Quick Access toolbar
creating a part
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
sketch the outline of the part
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
dynamic input
Dynamic Input
  • Polar or Cartesian Coordinates
  • Dimension Input
sketch the outline of the part1
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
slide13

Sketch the Outline of the Part

  • Automatic Constraints
    • Constraint symbols
  • Scrubbing
    • Different constraint applied
    • Move the cursor so it touches an edge
common sketch
Common Sketch
  • Center-point Circle
  • Tangent Circle
  • Three-Point Arc
  • Tangent Arc
  • Center-Point Arc
  • Two-Point Rectangle
  • Three-Point Rectangle
  • Two-Point Center Rectangle
  • Three-Point Center Rectangle
  • Fillet
  • Chamfer
  • Polygon
  • Mirror
  • Rectangular Pattern
  • Circular Pattern
  • Offset
  • Trim
  • Extend
slide15

Select Objects

  • Selecting Objects
    • Individually objects
    • Window and Crossing
    • Color change
  • Deleting Objects
    • Right-click Delete
    • Delete on keyboard
measure commands
Measure Commands
  • Measure
    • Distances
      • Points
      • Edges
      • Faces
      • Parts
    • Angles
    • Loops
    • Area
    • Region Properties
measure tools
Measure Tools
  • Measure
    • Additional Options
    • Click the arrow in the Measure dialog box
exercise 2 1
Exercise 2-1
  • Creating A Sketch With Lines

Exercise 2-2

  • Creating a Sketch With Tangencies
constraining the sketch
Constraining the Sketch
  • Step 2 - Geometric Constraints
    • Apply behavior
    • Create relationships
      • Status Bar
      • Fully constrain
      • Use projected origin point
    • Constraint Types
      • 12 geometric constraints
constraining the sketch1
Constraining the Sketch
  • Geometric Constraints
    • Dragging a Sketch
      • Constrained or Not
    • Showing Constraints
      • Status Bar
      • Show All = F8
      • Hide All = F9
      • Objects change color
    • Deleting Constraints
      • Select constraint icon and then right-click Delete or Delete key
construction geometry
Construction Geometry
  • Sketch tab > Format panel
  • Add dimensions and constraints
  • Not visible when a feature is created
  • Always available in the sketch
sketch degrees of freedom
Sketch Degrees of Freedom
  • To see open degrees of freedom in a sketch
    • Status Bar - Show All Degrees of Freedom
exercise 2 3
Exercise 2-3
  • Adding and Displaying Constraints
adding dimensions manually
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
adding dimensions
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
adding dimensions1
Adding Dimensions
  • Entering and Editing a Dimension’s 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
adding dimensions2
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
slide28

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
Exercise 2-4
  • Constraining and Dimensioning a Sketch
inserting 2d autocad data
Inserting 2D AutoCAD Data
  • Insert 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)
importing other file types
Importing Other File Types
  • DXF
  • Alias
  • Catia
  • IDF Board File
  • IGES
  • JT
  • NX Files
  • Parasolids Binary Files
  • Parasolids Text Files
  • PRO/Engineer Files
  • Rhino Files
  • SAT
  • STEP
  • STL
  • SolidWorks Files
exercise 2 5
Exercise 2-5
  • Inserting AutoCAD Data
applying your skills
Applying Your Skills
  • Skill Exercise 2-1 Skill Exercise 2-2
checking your skills
Checking Your Skills
  • True__ False__ When you sketch, constraints are not applied to the sketch by default.
  • True__ False__ When you sketch and a point is inferred, a constraint is applied to represent that relationship.
  • True__ False__ A sketch does not need to be fully constrained.
  • True__ False__ When working on an mm part, you cannot use English (inch) units.
  • True__ False__ After a sketch is constrained fully, you cannot change a dimension’s value.
  • True__ False__ A driven dimension is another name for a parametric dimension.
  • True__ False__ Dimensions placed dynamically are not parametric.
  • True__ False__ You can import only 2D AutoCAD data into Autodesk Inventor.
  • Explain how to draw an arc while in the Line command.
  • Explain how to remove a geometric constraint from a sketch.

Continued

checking your skills continued
Checking Your Skills - continued
  • Explain how to change a vertical dimension to an aligned dimension while you place the dimension.
  • Explain how to create a dimension between two quadrants of two arcs.
  • True__ False__ AutoCAD needs to be installed to insert AutoCAD geometry.
  • True__ False__ When a sketch is extruded that contains construction geometry, the construction geometry is deleted.
  • Explain how to change the unit type in a part file.
  • True ___ False ___ To scale the entire sketch when placing the first dimension you must right-click and check Scale from the menu.
  • True ___ False ___ When a Pushpin appears in the Sketch icon in the browser the sketch is fully constrained.
  • True ___ False ___ An arc length dimension can only be a driven dimension.
  • Explain how to draw a rectangle that is centered on the origin point.
  • True ___ False ___ When creating the first 2D sketch you must select an origin plane from the browser's Origin folder.